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  1.  2
    The changing Pattern of German Social Life.Ulrich Planck - 1969 - Philosophy and History 2 (2):196-196.
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    German Agricultural History. [REVIEW]Ulrich Planck - 1974 - Philosophy and History 7 (2):196-198.
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    History of German Agriculture from the Early Middle Ages until the 19th Century. [REVIEW]Ulrich Planck - 1980 - Philosophy and History 13 (2):182-182.
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