1.

図書
図書
1. Agricultural production functions
Earl O. Heady, John L. Dillon
出版情報: Ames : Iowa State University Press, c1961
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2.

図書
図書
2. Economics of agricultural production and resource use
Earl O. Heady
出版情報: New York ; N.J. : Prentice-Hall, 1952
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3.

図書
図書
3. Agricultural supply functions : estimating techniques and interpretation
edited by Earl O. Heady [et al.]
出版情報: Ames : Iowa State University Press, c1961
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4.

図書
図書
4. Roots of the farm problem : changing technology, changing capital use, changing labor needs
Earl O. Heady ... [et al.]
出版情報: Ames : Iowa State University Center for Agricultural and Economic Development, 1965
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