Cite

"19th Century Maps"

MLA

Erdoes, Richard, 1912-2008. "19th Century Maps". Box 46. 1976-1983, undated. https://collections.library.yale.edu/catalog/2077823.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 46"])(1976-1983, undated)["19th Century Maps"]. https://collections.library.yale.edu/catalog/2077823.