Pennsylvania's mineral heritage - The Commonwealth at the economic crossroads of her industrial development
- Författare
- Pennsylvania state college Pennsylvania department of internal affairs
- (Pennsylvania department of internal affairs, The Pennsylvania state college.)
- Genre
- Ej skönlitteratur
- Språk
- Engelska
| Förlag | År | Ort | Om boken | ISBN |
|---|---|---|---|---|
| 1944 | USA, Harrisburg | 248 sidor. |