Cite

1930 census map of Oklahoma / George F. Cram Company, engravers and publishers.

MLA

Company, George F. Cram. 1930 Census Map of Oklahoma / George F. Cram Company, Engravers and Publishers. George F. Cram, 0AD. https://collections.library.yale.edu/catalog/15814884.

APA, 6th edition

Company, G. F. C. (0 C.E.). 1930 census map of Oklahoma / George F. Cram Company, engravers and publishers. [Maps]. George F. Cram, https://collections.library.yale.edu/catalog/15814884.