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john c ferm
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A Study of roof falls in underground mines on the Pocahontas #3 seam, southern West Virginia and southwestern Virginia
John C. Ferm · Carolina Coal Group, Dept. of Geology, University of South Carolina
83 sayfa · 1978
Coal mines and mining / Mining geology
A field guide to Allegheny deltaic deposits in the upper Ohio Valley
John C. Ferm · Sine nomine
21 sayfa · 1969
Geology / Sedimentation and deposition / Stratigraphic Geology

