Author: WHITTINGTON, H.B.
Title: Yohoia Walcott and Plenocaris n. gen., arthropods from the Burgess Shale, Middle Cambrian, British Columbia.
Description: 1974. Geological Survey of Canada Bulletin 231; 63 pp. 30 fig. 18 plts. Orig. wrps. libr. stamp in corner of front cover, very good.

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