[059-60] An Occurrence of Hexagonaria in the Grand Tower Formation of Southern Illinois and Southeastern Missouri

Fraunfelter, George H.

An Occurrence of Hexagonaria in the Grand Tower Formation of Southern Illinois and Southeastern Missouri

Recent Advances in Spectroscopy* Author: Michelson, A.A.

Farm Water Supply Author: Bartow, Edward

The Relation of the State Academy of Science to the Natural History Surrounding the Chicago Academy of Sciences Author: Baker, F.C.

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Recent Advances in Spectroscopy* Author: Michelson, A.A.

Farm Water Supply Author: Bartow, Edward

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