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Charles Kephart Swartz
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Second report on the coals of Maryland
Charles Kephart Swartz · Johns Hopkins press
296 sayfa · 1920
Coal / Coal mines and mining / Therapeutic use / Vibration
Pawpaw-Hancock folio, Maryland-West Virginia-Pennsylvania
George Willis Stose, Charles Kephart Swartz, Geological Survey (U.S.) · U. S. Geological Survey
24 sayfa · 1912
Geology / Maps