Books by John W. Marr:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Marr, John W. (John Winton), 1914-: Environment of Mesa Verde, Colorado (U.S. National Park Service, 1969), also by James A. Erdman and Charles L. Douglas (page images at HathiTrust)
Find more by John W. Marr at your library, or elsewhere.