Inundated Anthracite Reserves, Eastern Middle Field of Pennsylvania, by S.H. Ash, H.D. Kynor, R.W. Fatzinger, B.S. Davies Et J.C. Gilbert

by S. H. Ash, H. D. Kynor, R. W. Fatzinger, B. S. Davies, J. C. Gilbert, Etats-Unis. Mines (Bureau) · 1950