| 1.
図書 |
図書
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by Donald R. Mitchell
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| 2.
図書 |
図書
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John D. Black ... [et. al.]
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| 3.
図書 |
図書
|
J. Norman Efferson
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| 4.
図書 |
図書
|
prepared by members of the Division of Farm Management and Costs, Bureau of Agricultural Economics, U.S.D.A.
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