Vereniging Koninklijke Nederlandsche Heidemaatschappij Cycling of mineral nutrients in agricultural ecosystems
first International environmental symposium of the Royal Netherlands Land Development Society (Koninklijke Nederlandsche Heide Maatschappij), cosponsored by the International Association for Ecology (INTECOL) and Elsevier Scientific Publishing Company, held in Amsterdam, the Netherlands, May 31st-June 4th, 1976
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