Geology and Mineral Resources of York County, Pennsylvania George Willis Stose Published: 1939 Total Pages: 216 Get eBook
Geology and Mineral Deposits of the St. Regis-Superior Area, Mineral County, Montana Arthur B. Campbell Published: 1960 Total Pages: 334 Get eBook
Geology and mineral resources of Bucks County, Pennsylvania Pennsylvania. Topographic and Geologic Survey Published: 1959 Total Pages: 264 Get eBook
Geology and Mineral Resources of Bucks County, Pennsylvania Bradford Willard Published: 1959 Total Pages: 266 Get eBook
TimeWalk - A Journey Through Time in Adams, Lancaster and York Counties, Pennsylvania Published: 2008-01-01 Total Pages: 120 Get eBook
Hydrogeology Of, and Simulation of Ground-water Flow In, a Mantled Carbonate-rock System, Cumberland Valley, Pennsylvania Douglas C. Chichester Published: 1996 Total Pages: 56 Get eBook