Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania, in three volumes, with a new geological map of the state, a map and list of bituminous mines
Paged continuously; v. 1: xix, 719 p.; v. 2: xxv, [721]-1628 p.; v. 3, pt. 1: xix, 1629-2152 p.; v. 3, pt. 2: xxiii, 2153-2638 p vol. I. Laurentian, Huronian, Cambrian and Lower Silurian formations, J. P. Lesley.--vol. II. Upper Silurian and Devonian formations, by J. P. Lesley.--vol. III, pt I. Carboniferous formation, by J. P. Lesley., E. V. d'Invilliers, and the New Red of Bucks and Montgomery counties, by B. S. Lyman
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