Oklahoma: Ground Water Irrigation1940-1961unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_031_14_0000_1_50The document represents a map of Oklahoma indicating by county the number of acres irrigated from ground water. Also indicated on the map are the areas of the Arkansas River Basin and the Red River Basin. Map; 10 7/8 x 21 1/2 inches.