Sixteenth census of the United States: 1940. :
Areas of the United States. 1940 /
Prepared under the supervision of Clarence E. Batschelet, geographer.

APA Citation

United States. Bureau of the Census. (1942). Sixteenth census of the United States: 1940.: Areas of the United States. 1940. Washington: U.S. Govt. print. off..

MLA Citation

United States. Bureau of the Census. Sixteenth Census of the United States: 1940.: Areas of the United States. 1940. Washington: U.S. Govt. print. off., 1942.

Warning: These citations may not always be complete (especially for serials).