Annual Report on the Geological Survey of the State of Pennsylvania Geological Survey of Pennsylvania Published: 1887 Total Pages: 348 Get eBook
The Geology of Pennsylvania Geological Survey of Pennsylvania Published: 1858 Total Pages: 716 Get eBook
Geological Survey of Pennsylvania Pennsylvania. State Geologist (1874-1890) Published: 1895 Total Pages: 140 Get eBook
The Geology of Pennsylvania Pennsylvania. State Geologist (1836-1841) Published: 1858 Total Pages: 1196 Get eBook
The Geology of Pennsylvania; a Government Survey. With a General View of the Geology of the United States, Essays on the Coal-formation and Its Fossils, and a Description of the Coal Fields of North America and Great Britain. (Maps.) [With Plates and Diagrams.] Henry Darwin Rogers Published: 1858 Total Pages: 482 Get eBook
Summary Description of the Geology of Pennsylvania ... Pennsylvania. Bureau of Topographic and Geologic Survey Published: 1892 Total Pages: 2638 Get eBook
Annual Report of the Geological Survey of Pennsylvania Pennsylvania. Geological Survey Published: 1886 Total Pages: 868 Get eBook
A Summary Description of the Geology of Pennsylvania: Laurentian, Huronian, Cambrian and Lower Silurian formations J. Peter Lesley Published: 1892 Total Pages: 752 Get eBook
