Mining. Hydraulic. Placer Placer gold and how it is secured. Good aritcle. Frontier Times v.28 #12 S 1951 P.343-347 colorado woman wins ninth annual "world Gold panning championship." 1969 "The geology of the gold placers of Colorado," thesis (School of Mines) by Ben H. Parker, Jr. (classified T9o5; 4 vols.) Colorado School of Mines Library Feature on Vic Crouch and his gold panning business on Colorado 119 near Central City. RMN Je 24, 1973 p.8
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