P.G. · P S · S. G. · State Geologist
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Report of Progress in ..., Part 6 | 978-1-142-75829-5 (1-142-75829-X) | 2010 | Pennsylvania. Board Of Commissioners For |
| The Geology of Lehigh and Northampton Counties, Volume 14 | 978-1-141-99531-8 (1-141-99531-X) | 2010 | |