Distribution of Oklahoma Indian Population by Counties from the 1940 Census, Adjusted1947-01-01unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_053_4_0000_1_67BThis is the second map in a series of three produced by the Department of the Interior, Office of Indian Affairs, focusing on population and including an attachment that explains population and services. Dimensions: 18 1/4 x 26 1/4