The ancient volcanic rocks of South mountain, Pennsylvania /
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| Main Author: | |
|---|---|
| Format: | Book |
| Language: | English |
| Published: |
Washington :
Govt. Print. Off.,
1896.
|
| Series: | Bulletin of the United States Geological Survey ;
no. 136. |
| Subjects: | |
| Local Note: | With: nos. 134-135 of the series. Bound together subsequent to publication. |