1940 Census Enumeration District Descriptions - Iowa - Polk County - ED 77-14, ED 77-15, ED 77-16, ED 77-17, ED 77-18, ED 77-19, ED 77-20

Chicago citation style
Department of Commerce. Bureau of the Census. Office of the Assistant Director for Operations. Geography Division. (3/13/1947 - 1968). 1940 Census Enumeration District Descriptions - Iowa - Polk County - ED 77-14, ED 77-15, ED 77-16, ED 77-17, ED 77-18, ED 77-19, ED 77-20. 1850-01-01/1950-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5845268. (Accessed December 18, 2018.)
APA citation style
Department of Commerce. Bureau of the Census. Office of the Assistant Director for Operations. Geography Division. (3/13/1947 - 1968), (1850-01-01/1950-12-31) 1940 Census Enumeration District Descriptions - Iowa - Polk County - ED 77-14, ED 77-15, ED 77-16, ED 77-17, ED 77-18, ED 77-19, ED 77-20. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5845268
MLA citation style
Department of Commerce. Bureau of the Census. Office of the Assistant Director for Operations. Geography Division. (3/13/1947 - 1968). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/5845268>.
Note: These citations are programmatically generated and may be incomplete.