"The Pittsburg coal beds."; "White, I. C. (Israel Charles), 1848-1927."; "Coal--Geology--Pennsylvania."; "White, I. C. (Israel Charles), 1848-1927."; "1898"; "Journal article reprint from: The American Geologist, v.21 (1898:Jan.)"; ""; "P535"; "pec"; "Coal--Geology--Pennsylvania."; "14256"; .