Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsatzliche Verfahren der oekologischen Landwirtschaft / Le Maintien de la Fertilite des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit - Papers * Exposes * Referate Presented at the 2nd International Conference held by IFOAM, Montreal, October 1-5 1978 / Exposes * Papers * Referate Presentes a la 3eme Conference internationale organisee par IFOAM, Bruxelles, du 3 au 5 septembre, 1980 (Paperback, 1982 ed.)
Stuart Hill, Pierre Ott
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