George H. Fraunfelter
An Occurrence of Rhizocorallium in the Upper Caseyville Formation (Lower Pennsylvanian) of Southern Illinois
George H. Fraunfelter
An Occurrence of Rhizocorallium in the Upper Caseyville Formation (Lower Pennsylvanian) of Southern Illinois
Recent Advances in Spectroscopy* Author: Michelson, A.A.
The Relation of the State Academy of Science to the Natural History Surrounding the Chicago Academy of Sciences Author: Baker, F.C.
Recent Advances in Spectroscopy* Author: Michelson, A.A.