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_aUnderahl, Norman R. _9116129 |
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_aSpecific pathogen free swine _b: development, application, consequences |
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_aLincoln : _bUniv. of Nebraska, _c1973 |
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| 300 | _a157 p. | ||
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_aGanado porcino _xMejoramiento. _945382 |
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_aGanado porcino _xResistencia a enfermedades. _945404 |
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