Congressional districts of the United States

Chicago citation style
United States. National Bureau of Standards. Congressional districts of the United States. 1969. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011394589. (Accessed December 11, 2018.)
APA citation style
United States. National Bureau of Standards, (1969) Congressional districts of the United States. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011394589
MLA citation style
United States. National Bureau of Standards. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/011394589>.
Note: These citations are programmatically generated and may be incomplete.