"A Comparative Study of the National Park Systems of Britain and the United States," CRP 381, undated

"A Comparative Study of the National Park Systems of Britain and the United States," CRP 381, undated, Box: COLT013, Folder: 5. Peter Oakley Coltman collection, COLT. Alexander Architectural Archives. https://archives.lib.utexas.edu/repositories/2/archival_objects/86754 Accessed September 26, 2026.