Denver Public Library Western History/Genealogy Digital Collections

- Leadville Opera House project, 1933
- Photoprint of a watercolor of Leadville, Colorado's Tabor Opera House original scenery. Painted by Muriel Wolle as part of her University of Colorado scenery project, the painting depicts two women in togas on pedestals flanking a center pedestal...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Photoprint of two watercolors of Leadville, Colorado's Tabor Opera House original scenery. Painted by Muriel Wolle's as part of her University of Colorado scenery project, one painting is a three panel scene of water and sky; the other is of a...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- This watercolor of Leadville, Colorado's Tabor Opera House original scenery was painted by Muriel Wolle as part of her University of Colorado scenery project and includes details of a Rococo doorway arch and decorative panels. In December 1933 a...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Photoprint of a watercolor of Leadville, Colorado's Tabor Opera House original scenery. Painted by Muriel Wolle as part of her University of Colorado scenery project, the painting has four elements, each of a room interior with decorative stenciled...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Photoprint of of a watercolor of Tabor Opera House original scenery, Leadville, Colorado. Painted by Muriel Wolle as part of her University of Colorado scenery project, the painting has two elements. The left one is of a front end of locomotive...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Photoprint of a watercolor of the Tabor Opera House original scenery in Leadville, Colorado. Painted by Muriel Wolle's as part of her University of Colorado scenery project, the painting has three elements that include details of Lake County...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Photoprint of a watercolor of the Leadville, Colorado's Tabor Opera House's original scenery. Painted by Muriel Wolle as part of her University of Colorado scenery project, the painting has four elements, with the two pairs stacked and each pair...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- [1933]
- Leadville Opera House scenery project, 1933
- Group portrait of Muriel Wolle's December, 1933, University of Colorado scenery project team at the Tabor Opera House, Leadville, Colorado. Left to right are Max Vawter (Herald-Democrat press reporter), Frank Geck, Mr. Jolly (stage manager from...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Opera houses--Colorado--Leadville--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Interior of the Opera House, scenery project, 1933
- In the interior view of the Tabor Opera House, Leadville, Colorado, the stage is full of painted drops and flats of ornate doorways, columns, and balustrades. Frank Geck is seated on the left while Newton Winburne and Eugene Iray, stage crew...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Interior of the Opera House, 1933
- Interior view of Tabor Opera House, Leadville, Colorado, across the wooden floor of the stage to the seating area where Muriel Wolle sits in a first row seat, between Eugene Irey (student) seated on the edge of the stage and June West, standing....
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Interior view of the Tabor Opera House stage in Leadville, Colorado. The lighted stage has a painted flat of a Rococo room interior with an ornate doorway, a fireplace with a mirror, marble columns framed by a painted tasselled curtain. The set was...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- This view of the Tabor Opera House stage flats in Leadville, Colorado shows original flats used for forest and garden sets with tropical vegetation and a satyr. The flats were a part of Muriel Wolle's University of Colorado scenery project in which...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- This view of the Tabor Opera House stage flats in Leadville, Colorado includes original flats used for forest and garden sets with tropical vegetation and a satyr. The set is part of Muriel Wolle's University of Colorado scenery project in which a...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- This view of the Tabor Opera House "Palace Drop" in Leadville, Colorado shows a vast hall in sharp perspective with columned arches and a black and white marble floor. The flat was lent to the Denver Theatre for its opening of "Silver Dollar"....
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- Interior view of Tabor Opera House stage, Leadville, Colorado. Stage has painted flat of a room interior with ornate doorways, marble columns, and balustrade framed by a painted tasselled curtain. A spotlight ray angles diagonally in front of...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Leadville Opera House scenery project, 1933
- This view of a Tabor Opera House stage flat in Leadville, Colorado includes a painted Rococo room interior with an ornate doorway and a fireplace with mirror. The flat is part of Muriel Wolle's University of Colorado scenery project in which a...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- [1933]
- Leadville Opera House scenery project, 1933
- Photoprint of watercolor of Leadville, Colorado's Tabor Opera House "Palace Drop". The painting depicts a vast hall in sharp perspective with a series of columned arches and a black and white marble floor. The original drop was lent to the Denver...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- [1933]
- Leadville Opera House, 1933
- This interior view of the Tabor Opera House stage, in Leadville, Colorado, was taken from an upper balcony. The stage has a painted flat of an interior with a bay window and wainscoting, framed by marble columns and a painted draped curtain. The...
- Tabor Opera House--1930-1940.; Leadville (Colo.)--1930-1940.; Interiors.; Opera houses--Colorado--Leadville--1930-1940.; Theaters--Colorado--Leadville--1930-1940.; Theatrical productions--1930-1940.; Wolle, Muriel Sibell, 1898-1977.
- 1933
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle residence, Boulder, Boulder County, Colorado; shows a wood table and chairs, cabinets and shelves with cups, saucers, and plates, a flower vase, thermometer, and stairs.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1930-1970.; Dining rooms--Colorado--Boulder--1930-1970.; Interiors--Colorado--Boulder--1930-1970.
- [between 1933 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle residence, Boulder, Boulder County, Colorado; shows furniture with striped upholstery, Navajo rugs, wooden chairs, and hanging paper letters: "Bon Voyage."
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Interiors--Colorado--Boulder--1940-1970.; Living rooms--Colorado--Boulder--1940-1970.
- [between 1945 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle residence, Boulder, Boulder County, Colorado; shows furniture with striped upholstery, Navajo rugs, potted plants, and hanging paper letters: "Bon Voyage."
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts--1940- 1970.; Boulder (Colo.)--1940-1970.; Interiors--Colorado--Boulder--1940-1970.; Living rooms--Colorado--Boulder--1940-1970.
- [between 1945 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle residence, Boulder, Boulder County, Colorado; shows a paper fish and hanging paper letters reading: "Bon Voyage."
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Interiors--Colorado--Boulder--1940-1970.
- [between 1945 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle residence, Boulder, Boulder County, Colorado; shows dinnerware and a wine bottle on a table. A paper fish and dove (a pinata?), hang from the ceiling; woven figures (cowboy and burro) are on stairs, and a...
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Dining rooms--Colorado--Boulder--1940-1970.; Festive decorations--Colorado--Boulder--1940-1970.; Interiors--Colorado--Boulder--1940-1970.
- [between 1945 and 1970]
- Boulder Wolle residence, possibly
- Interior view of a brick fireplace and furniture in the Muriel S. Wolle home (?), Boulder, Boulder County, Colorado.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1930-1970.; Interiors--Colorado--Boulder--1930-1970.
- [between 1933 and 1970]
- Boulder
- Rear view of the Francis and Muriel Sibell Wolle home, under snow, in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Houses--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of the alley (with snow) behind the Francis and Muriel Sibell Wolle home, Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Alleys--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of snow and shoveled sidewalks at the Francis and Muriel Sibell Wolle home, 763 16th (Sixteenth) Street, Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Sidewalks--Colorado--Boulder--1940-1970.; Streets--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of snow and shoveled sidewalks at the Francis and Muriel Sibell Wolle home, 763 16th (Sixteenth) Street, Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Sidewalks--Colorado--Boulder--1940-1970.; Snow--Colorado--Boulder--1940-1970.; Streets--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of a snow-covered tree in the yard of Francis and Muriel Wolle in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Snow--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of snow and shoveled sidewalks at the Francis and Muriel Sibell Wolle home, 763 16th (Sixteenth) Street, Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Sidewalks--Colorado--Boulder--1940-1970.; Snow--Colorado--Boulder--1940-1970.; Streets--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of tulips, garage wall, and lawn chairs at the Francis and Muriel Wolle home in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Backyards--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of picket fence and the Flatirons from the Francis and Muriel Wolle garden, Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Fences--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of backyard with flagstone walk, garage, tulips, and garden chairs at the Francis and Muriel Wolle home in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Backyards--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of Backyard, a flagstone path, garage, tulips, and garden chairs at the Francis and Muriel Wolle home in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Backyards--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of a backyard, a garage, flowers, and garden chairs at the Francis and Muriel Wolle home in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Backyards--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder
- View of tulips, lawn, and picket fence in the Francis and Muriel Wolle garden in Boulder, Boulder County, Colorado.
- Wolle, Francis, 1889---Homes & haunts.; Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1940-1970.; Backyards--Colorado--Boulder--1940-1970.
- [between 1947 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home in Boulder, Boulder County, Colorado; shows a banquet table displaying the 10,001st copy of her book "Stampede to Timberline." Previous editions of the book are displayed on the stairs, each with a...
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Stairways--Colorado--Boulder--1950-1970.
- [between 1954 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows chairs, couches, Native American rugs, and bookshelves stuffed with notebooks. Rows of string display greeting cards.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Living rooms--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a Christmas tree and presents.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas trees--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a Christmas tree, presents, furniture, and wreaths in windows.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas trees--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a Christmas tree, presents, a man reading, furniture, and wreaths in windows.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas trees--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Reading--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder, County, Colorado, shows a Christmas tree, wreaths, Native American rugs, and striped furniture.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas trees--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder, County, Colorado, shows a Christmas tree, wreaths, Native American rugs, striped furniture, and an elderly man reading.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas trees--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Reading--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows boxes of "Ready Jell," a briefcase, bookshelves, and a metal mask.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Tables--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows wreaths, Christmas decorations, bookshelves and furniture.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas decorations--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a Christmas tree, presents, furniture, and wreaths in windows.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Christmas decorations--Colorado--Boulder--1950-1970.; Christmas trees--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a cushioned arm chair, a reading lamp on a table, bookshelves, magazine caddy, and decorative items.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Chairs--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Lamps--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a cushioned arm chair, a reading lamp on a table, bookshelves, magazine caddy, and decorative items.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Chairs--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a cushioned arm chair, a reading lamp on a table, bookshelves, magazine caddy, decorative items and artwork.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Lamps--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]
- Boulder Wolle residence
- Interior view of the Muriel Sibell Wolle home, Boulder, Boulder County, Colorado; shows a cushioned arm chair, reading lamp, book shelves, decorative items, magazine caddy, and artwork.
- Wolle, Muriel Sibell, 1898-1977--Homes & haunts.; Boulder (Colo.)--1950-1970.; Chairs--Colorado--Boulder--1950-1970.; Interiors--Colorado--Boulder--1950-1970.; Lamps--Colorado--Boulder--1950-1970.
- [between 1950 and 1970]