Letters, 1935-1938, to Lewis Mumford.
Related Entities
There are 2 Entities related to this resource.
University of Pennsylvania. Dept. of History and Sociology.
http://n2t.net/ark:/99166/w6gb96h7 (corporateBody)
Crawford, William Rex, 1898-1976
http://n2t.net/ark:/99166/w6c5578b (person)