Petrunkevitch, Alexander, 1945, Palaeozoic Arachnida. An inquiry into their evolutionary trends

Petrunkevitch, Alexander, 1945, Palaeozoic Arachnida. An inquiry into their evolutionary trends, Scientific Papers, Illinois State Museum 3, No. 2, pp. 1-76

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urn:lsid:zoobank.org:pub:37BC230646B54295B133095A860CE90E

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