Petrunkevitch, A. (1949). A study of the structure, classification and relationship of the Paleozoic Arachnida. Transactions of the Connecticut Academy of Arts and Sciences. 37: 69-315.
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Petrunkevitch, A.
1949
A study of the structure, classification and relationship of the Paleozoic Arachnida
Transactions of the Connecticut Academy of Arts and Sciences