7 books
... Final Report Ordered by Legislature, 1891
The geology of the South Mountain belt of Berks County
The Geology of Centre County (Volume 4)
Report on the Geology of the Four Counties, Union, Snyder, Mifflin and Juniata with Descriptions (Volume 18, PT. 1); Of the Clinton Fossil Ore Mines, Marcellus Carbonate Iron Ore Mines, Oriskany Glass Sand Mines, and Lewistown Limestone Quarries
Report on the Geology of the Four Counties, Union, Snyder, Mifflin and Juniata with Descriptions
The Geology of Huntingdon County, Volume 59
Report of the Geology of the Four Counties Union, Snyder, Mifflin and Juniata