Beads of meteoric iron from an Indian mound near Havana, Illinois

by Grogan, Robert Mann, 1912-
Published 1948

Beads of meteoric iron from an Indian mound near Havana, Illinois

by Grogan, Robert Mann, 1912-
Published 1948

Structures due to volume shrinkage in the bedding-replacement fluorspar deposits of southern Illinois

by Grogan, Robert Mann, 1912-
Published 1949

Agricultural limestone resources of Cumberland,

by Grogan, Robert Mann, 1912-
Published 1940

Omaha pool and mica-periodotite intrusives, Gallatin County, Illinois,

by English, R. M, Grogan, Robert Mann, 1912-
Published 1948

Illinois surface clays as bonding clays for molding sands, an exploratory study,

by Grogan, Robert Mann, 1912-, Lamar, J. E (John Everts), 1897-1979
Published 1945

Agricultural limestone resources of Cumberland, Effingham, Clay, Richard, and Jasper counties,

by Grogan, Robert Mann, 1912-, Lamar, J. E (John Everts), 1897-1979
Published 1940

Geology of the fluorspar deposits of Illinois

by Weller, J. Marvin (James Marvin), 1899-1976, Weller, J. Marvin (James Marvin), 1899-1976, Grogan, Robert Mann, 1912-, Tippie, Frank Emerson
Published 1952

Short papers on geologic subjects: Present state of knowledge regarding the pre-Cambrian crystallines of Illinois,

Published 1950