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The Josephine Porter Institute

Ehrenfried Pfeiffer: Pioneer of Spiritual Research and Practice by Alla Selawry

Ehrenfried Pfeiffer: Pioneer of Spiritual Research and Practice by Alla Selawry

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Chapters provide detailed discussions of trace elements, tillage, the N,P&K concept, animal health, crops, soil carbon and calcium, insects, soil life, crop rotation, and much more.

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