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Statistics in research : basic concepts and techniques for research workers / Bernard Ostle, Richard W. Mensing.
- 519.5072 O855 1975
- Ostle, Bernard,
- Iowa State University Press,
- 1975. ©1975
- Ames :
-
Agricultural production functions / Earl O. Heady, John L. Dillon.
- 338.1015118 H4338
- Heady, Earl O. 1916-1986.
- Iowa State University Press,
- c1961.
- Ames :