Books by Paul Castleton Hatmaker:
Books in the extended shelves:
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Hatmaker, Paul Castleton, 1900-: The fluorspar industry of the United States with special reference to Illinois-Kentucky district (State Geological Survey, 1938), also by Hubert Wesley Davis and United States. Dept. of the Interior (page images at HathiTrust)
Find more by Paul Castleton Hatmaker at your library, or elsewhere.