Subject search: "Geology — Pennsylvania — Maps."
Division V, Central and South-eastern Pennsylvania, Part I : Contains Thirty-five Sheets. Twenty-nine Sheets Relating to the Topography and Geology of the Paleozonic Strata in Parts of Cambria, Blair, Bedford, Huntingdon, Mifflin, Centre and Union Counties. Five Sheets Contain A Map and Geological Cross Section Along the East Bank of the Suquehanna River, Lancaster County. One Sheet Contains Cross Sections of the Philadelphia Belt of Azoic Rocks. 1885