Books by Dorothy F. Friedman:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Friedman, Dorothy F.: Proceedings of the Symposium on the Use of Diesel-powered Equipment in Underground Mining, Pittsburgh, Pa., January 30-31, 1973 (U.S. Dept. of the Interior, Bureau of Mines, 1975), also by Symposium on the Use of Diesel-powered Equipment in Underground Mining (1973 : Pittsburgh), Bruce F. Grant, and United States Bureau of Mines (page images at HathiTrust)
Find more by Dorothy F. Friedman at your library, or elsewhere.