horse-racing. Colorado Jim Gorman built first Colorado horse-race track with his friend Jack Gaynor. Western Thoroughbred June, 1950 p.5 A history of Quarter racing. Quarter Horse Journal v.3 #2 Nov., 1950 p.14 History of Quarter racing. Quarter Horse Journal v.3 #2 Nov., 1950 & v.3 #3 Dec., 1950 Pari-mutuel tracks add $1,368,539 to state treasury. R14N Sept. 25, 1950