Books by Marvin J. Shaffer:
Books in the extended shelves:
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Shaffer, Marvin J.: Prediction of mineral quality of irrigation return flow (Ada, Oklahoma : Environmental Protection Agency, Office of Research and Development, Robert S. Kerr Environmental Research Laboratory, Source Management Branch, 1977., 1977), also by Engineering and Research Center (U.S.), Charles W. Huntley, Richard W. Ribbens, United States. Environmental Protection Agency. Office of Research and Development, and Robert S. Kerr Environmental Research Laboratory. Source Management Branch (page images at HathiTrust)
Find more by Marvin J. Shaffer at your library, or elsewhere.