- Petrified Forest National Park
| Peirce, H.W. (1990), AZ Geol. Sur. Industrial Minerals card file. Peirce, .W. and J.R. Scurlock (1972), Arizona well information, AZ Bur. Mines Bull. 185 Peirce, H.W., S.B. Keith and J.C.Wilt (1970), Coal, oil, natural gas, helium, and uranium in Arizona, AZ Bur. Mines Bull. 182 |
Kern County Land Company drill hole, Petrified Forest National Park, Apache County, Arizona, USA