Program: HathiTrust Digital Library
- Publisher: Commonwealth of Pennsylvania, Dept. of Environmental Resources, Topographic and Geologic Survey
- Print ISSN:
- Electronic ISSN:
- OCLC Number: 6560539
- Validation: None
- Retention: permanent
- Institution: HathiTrust
- Facility:
- OCLC Symbol: HATHI
- Holdings Format: Print
| Materials | Archive Action | Date of Action | Program | Status/Note |
|---|---|---|---|---|
|
1998; 2008:Aug.
|
committed to retain | 2018-05-07 | HTDL |
|