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  1. 1
    Published 1974
    Subjects “...Field crops Diseases and pests Congresses....”
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    Biology in pest and disease control : the 13th Symposium of the British Ecological Society, Oxford, 4-7 January 1972 /
  2. 2
    Published 1977
    Subjects “...Field crops Diseases and pests Congresses....”
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    Origins of pest, parasite, disease and weed problems : the 18th Symposium of the British Ecological Society, Bangor, 12-14 April, 1976 /

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