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Walter Stappung – Die Düngerpräparate Rudolf Steiners Herstellung und Anwendung (in German)
The work is based on a careful study of Rudolf Steiner's Agriculture Course, with original quotations and references. It is the most comprehensive account of preparation work worldwide over the past 92 years. With many practical tips, scientific explanations, technical instructions and bibliographical references. The book is the result of decades of experience in Germany and abroad and intensive study of the specialist literature since 1924.