Books by H. A. Calkins:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Calkins, H. A. (Hartley Amasa), 1883-1962: The Abney level handbook. (Govt. print off., 1927), also by United States Forest Service and J. B. Yule (page images at HathiTrust)
Find more by H. A. Calkins at your library, or elsewhere.