http://pec.lib.wvu.edu/record/P12111897The Pittsburg coal beds : an address of Vice President I. C. White, Chairman of Section E, before the Section of Geology and Geography, American Association for the Advancement of Science, Detroit Meeting, August, 1897. Journal article reprint from: <em>Proceedings of the American Association for the Advancement of Science</em>, v.46 (1897). White, I. C. (Israel Charles), 1848-1927.Coal mines and mining--Pennsylvania--Pittsburgh.Coal mines and mining--Maryland.Coal mines and mining--West Virginia.Coal mines and mining--Ohio.14256