1. Ulrich Planck (1980). History of German Agriculture From the Early Middle Ages Until the 19th Century. Philosophy and History 13 (2):182-182.
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  2. Ulrich Planck (1974). German Agricultural History. Philosophy and History 7 (2):196-198.
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  3. Ulrich Planck (1969). The Changing Pattern of German Social Life. Philosophy and History 2 (2):196-196.
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