Title: Short papers on geologic subjects:  Present state of knowledge regarding the pre-Cambrian crystallines of Illinois,  by Robert M. Grogan; Factors affecting measurement of permeability of unconsolidated glacial material, by Robert D. Knodle. Facies analyzes of the Niagaran rocks, by Heinz A. Lowenstam. Physical characteristics of the oölite grains of the Ste. Genevieve formation, by Raymond S. Shrode
Subjects: Geology