| 1.
図書 |
図書
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prepared by Firman E. Bear ... [et al.]
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| 2.
図書 |
図書
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prepared in cooperation with the American Society of Agronomy ; edited by A.G. Norman
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| 3.
図書 |
図書
|
prepared in cooperation with the American Society of Agronomy ; edited by A.G. Norman
|
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| 4.
図書 |
図書
|
compiled by the Joint Committee on Soil Tilth, American Society of Agronomy [and] American Society of Agricultural Engineers ; Byron T. Shaw, editor
|
