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| Utgitt
| London ; Boston : Butterworths , 1981
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| Omfang
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| Opplysninger
| Includes bibliographies and index.. - Papers from a symposium held at Wye College, Ashford, Kent, Aug. 26-30, 1980, sponsored by the International Institute of Biological Husbandry.
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| Emner
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| ISBN
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