1.

図書
図書
1. The law of diminishing returns
Spillman, W. J. (William Jasper), 1863-1931 ; Lang, Emil
出版情報: New York : World Book Co., 1924
シリーズ名: New-World agriculture series / edited by W.J. Spillman
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目次情報:
pt. 1. The law of the diminishing increment by W.J. Spillman
pt. 2. The law of the soil by Emil Lang
pt. 1. The law of the diminishing increment by W.J. Spillman
pt. 2. The law of the soil by Emil Lang
2.

図書
図書
2. Balancing the farm output : a statement of the present deplorable conditions of farming, its causes, and suggested remedies
by W.J. Spillman
出版情報: New York : Orange Judd , London : K. Paul, Trench, Trubner, 1927
シリーズ名: Farm and garden library
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3.

図書
図書
3. Farm management
by W.J. Spillman
出版情報: New York : Orange Judd , London : Kegan Paul, Trench, Trubner, 1923
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