"Regional Planning: The Region - Past, Present, Future: A Digest of the Policies, Principles, Procedure and Findings of the Regional Planning Federation of the Philadelphia Tri-State District", 1931

"Regional Planning: The Region - Past, Present, Future: A Digest of the Policies, Principles, Procedure and Findings of the Regional Planning Federation of the Philadelphia Tri-State District", 1931, Box: 42, Folder: 13. Russell Van Nest Black papers, 3018. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/397999 Accessed July 06, 2025.