White Clay Deposits at Saylorsburg, Monroe County, Pennsylvania Frederick Buritt Peck Published: 1922 Total Pages: 16 Get eBook
Clays, Their Occurrence, Properties, and Uses Heinrich Ries Published: 1927 Total Pages: 630 Get eBook
Progress Report Pennsylvania. Bureau of Topographic and Geologic Survey Published: 1922 Total Pages: 186 Get eBook
List of U.S. Geological Survey Geologic and Water-supply Reports and Maps for Pennsylvania and New Jersey Published: 1988 Total Pages: 248 Get eBook