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By "Wilson, L. R. (Leonard Richard), 1906-1998"
An annotated synopsis of paleozoic fossil spores : and the definition of generic groups /
By: Schopf, James Morton, - Bentall, Ray, - Wilson, L. R. (Leonard Richard),
Publication info: Urbana :Illinois State Geological Survey,1944.
Holding Institution: University Library, University of Illinois Urbana Champaign