Biodiversity Heritage Library
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.
Contributed by: University Library, University of Illinois Urbana Champaign