Program: HathiTrust Digital Library
- Publisher: Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic & Geologic Survey
- Print ISSN: 0890-8516
- Electronic ISSN:
- OCLC Number: 6670986
- Validation: None
- Retention: permanent
- Institution: HathiTrust
- Facility:
- OCLC Symbol: HATHI
- Holdings Format: Print
| Materials | Archive Action | Date of Action | Program | Status/Note |
|---|---|---|---|---|
|
no.1 1982 revised edition
|
committed to retain | 2012-03-12 | HTDL |
|