By OPITZ DONALD L.   in Nuncius

ISSN:1825-3911|20|2|507-508

Brill‎(2005)‎

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By Opitz Donald L.   in Agricultural History Review

ISSN:0002-1490|62|1|119-145

British Agricultural History Society‎(2014)‎

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By Opitz Donald L.   in Archives of Natural History

ISSN:1755-6260|31|2|330-348

Edinburgh University Press‎(2004)‎

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