Otto Piper
Otto Piper (1841–1921) was a German architectural historian who, with August von Cohausen (1812–1896), is regarded as one of the two founders of scientific research into castles. Provided by Wikipedia-
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3by Piper, Otto, 1841-1921
Published 1902
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6by Piper, Otto, 1841-1921
Published 1914
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15by Piper, Otto, 1841-1921
Published 1922
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