| Item Description: | "Extensive use has been made of the reports of G. P. Grimsley on the gypsum of Kansas (University Geological Survey of Kansas, volume 5) and of Michigan (Michigan Geological Survey, volume 9); of F. A. Wilder on the gypsum of Iowa (Iowa Geological Survey, volume 12); of G. I. Adams and others on the gypsum of the United States (Bulletin United States Geological Survey number 223); and by W. F. Jennison on the gypsum of the maritime provinces of Canada (Canada Department of Mines, Mines branch, number 84)." |
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