1940 Census Enumeration District Maps - Iowa - Dallas County - Perry - ED 25-19A, ED 25-19B, ED 25-20A, ED 25-20B, ED 25-21A, ED 25-21B

Chicago citation style
Department of Commerce. Bureau of the Census. Office of the Associate Director for Decennial Census. Geography Division. (1/1987 - 7/15/2011). 1940 Census Enumeration District Maps - Iowa - Dallas County - Perry - ED 25-19A, ED 25-19B, ED 25-20A, ED 25-20B, ED 25-21A, ED 25-21B. 1880-01-01/1990-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5830384. (Accessed September 23, 2018.)
APA citation style
Department of Commerce. Bureau of the Census. Office of the Associate Director for Decennial Census. Geography Division. (1/1987 - 7/15/2011), (1880-01-01/1990-12-31) 1940 Census Enumeration District Maps - Iowa - Dallas County - Perry - ED 25-19A, ED 25-19B, ED 25-20A, ED 25-20B, ED 25-21A, ED 25-21B. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5830384
MLA citation style
Department of Commerce. Bureau of the Census. Office of the Associate Director for Decennial Census. Geography Division. (1/1987 - 7/15/2011). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/5830384>.
Note: These citations are programmatically generated and may be incomplete.