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The Importance of Biological Agriculture in a World of Diminishing Resources. August 27-30, 1984. Proceedings of the 5th IFOAM International Scientific Conference at the University of Kassel (Germany).
Witzenhausen. Verlagsgruppe Weiland, Happ, Burkhard. 1986. Well Illustrated. Paperback. 448pp. Edited by Harmut Vogtmann / Engelhard Boehncke / Inka Fricke. Very Good. ISBN 392605901X.
Worpsweder Antiquariat
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