Biodiversity Heritage Library
By "Kosanke, Robert M. (Robert Max) "
Pennsylvanian spores of Illinois and their use in correlation / by Robert M. Kosanke.
By: Kosanke, Robert M. - Illinois State Geological Survey.
Publication info: Urbana, Ill. :State Geological Survey,1950.
Contributed by: University Library, University of Illinois Urbana Champaign