Books by L. W. Orr:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Orr, L. W. (Leslie Wayne), 1902-: Protection against forest insects and diseases in the United States (U.S. Dept. of Agriculture, Forest Service, 1947), also by United States Forest Service, Carl Hartley, and Stephen N. Wyckoff (page images at HathiTrust)- Orr, L. W. (Leslie Wayne), 1902-: The spruce budworm in Minnesota (University of Minnesota, Agricultural Experiment Station, 1940), also by Samuel Alexander Graham (page images at HathiTrust)
- Orr, L. W. (Leslie Wayne), 1902-: Studies on natural vs. artificial control of the pine tobacco scale (University Farm, 1931) (page images at HathiTrust)
Find more by L. W. Orr at your library, or elsewhere.