 | Viets, Frank G. (Frank Garfield), 1916- 4n | (1) |
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 | Viets, Frank G. (Frank Garfield), 1916- 4n; Factors affecting the accumulation of nitrate in soil, water, and plants / by Frank G. Viets, Jr. and Richard H. Hageman. Washington, D.C. : Agricultural Research Service, U.S. Dept. of Agriculture, 1971. | |
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