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_aBaum, Emanuel L. _910858 |
| 245 | _aEconomic and technical analysis of fertilizer innovation and resource use | ||
| 260 |
_aAmes, Iowa : _bState College, _c1957 |
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_a393 p. _b: ilus. |
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_aAgricultura _xAspectos económicos. |
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_aFertilizantes. _940447 |
| 700 | 0 |
_aHeady, Earl Orel. _953236 |
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