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2
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Statistical methods / George W. Snedecor, William G. Cochran.
- 519.5 S6712s 1989
- Snedecor, George W. 1881-1974,
- Iowa State University Press,
- Ames :
-
Agricultural production functions / Earl O. Heady, John L. Dillon.
- 338.1015118 H4338
- Heady, Earl O. 1916-1986.
- Iowa State University Press,
- c1961.
- Ames :