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Oklahoma Census: 1910 & 1920: Volume 3: Map
Information from the Federal Censuses of Oklahoma in 1910 and 1920.
Per Cent of Negroes in Total Population, By Counties: 1920
1920 Oklahoma Census, Volume 3, Map
Source: United States. Bureau of the Census. Fourteenth census of the United States taken in the year 1920. Vol. III. Composition and characteristics of the population by states. Washington, Government Printing Office, 1922, p. 831.