1940 Census Enumeration District Maps - Oklahoma - Kay County - Blackwell - ED 36-2, ED 36-3A, ED 36-3B, ED 36-4, ED 36-5A, ED 36-5B, ED 36-6, ED 36-7

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 - Oklahoma - Kay County - Blackwell - ED 36-2, ED 36-3A, ED 36-3B, ED 36-4, ED 36-5A, ED 36-5B, ED 36-6, ED 36-7. 1880-01-01/1990-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5836345. (Accessed September 24, 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 - Oklahoma - Kay County - Blackwell - ED 36-2, ED 36-3A, ED 36-3B, ED 36-4, ED 36-5A, ED 36-5B, ED 36-6, ED 36-7. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5836345
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/5836345>.
Note: These citations are programmatically generated and may be incomplete.