Books by O. E. Hays:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Hays, O. E. (Orville Elton), 1909-: Conservation methods for the Upper Mississippi Valley (Fayette soil area) (U.S. Dept. of Agriculture, 1958), also by Robert E. 1923- Taylor (page images at HathiTrust)- Hays, O. E. (Orville Elton), 1909-: Cropping systems that help control erosion (Agricultural Experiment Station, University of Wisconsin, 1941), also by Noble Clark (page images at HathiTrust)
- Hays, O. E. (Orville Elton), 1909-: Erosion controlled by terraces (Agricultural Experiment Station, University of Wisconsin, 1951), also by H. B. Atkinson (page images at HathiTrust)
- Hays, O. E. (Orville Elton), 1909-: Organic matter improves the soil (Agricultural Experiment Station, University of Wisconsin, 1955), also by Robert E. 1923- Taylor and Clyde E. Bay (page images at HathiTrust)
Find more by O. E. Hays at your library, or elsewhere.