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Displaying 1-2 of 2 results for author "Bull, Leonard, 1939-"
Soil depletion estimates : version 2 : a user's guide to a personal computer model for estimating long-term onsite physical and economic impacts of soil depletion / Leonard L. Bull, Daniel E. Kugler.
- Text
- Washington, DC : U.S. Dept. of Agriculture, Economic Research Service, Resources and Technology Division, [1990]
- 1990
Residue and tillage systems for field crops [microform] / Len Bull.
- Text
- [Washington, DC] : U.S. Dept. of Agriculture, Economic Research Service, Resources and Technology Division, [1993]
- 1993
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