Author: NORFORD, B.S.
Title: The early Canadian (Tremadocian) trilobites Clelandia and Jujuyaspis from the southern Rocky Mountains of Canada.
Description: 1969. Geol. Surv. canada Bull. 182; pp. 1-15, 1 plt. with map and 2 plts. with trilobites h.t. Extract with orig. printed covers of issue, stapled, very good.

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