Program: HathiTrust Digital Library
- Publisher: Pub. for the Observatory by the McGraw-Hill Book col, Inc.
- Print ISSN:
- Electronic ISSN:
- OCLC Number: 13019918
- Validation: None
- Retention: permanent
- Institution: HathiTrust
- Facility:
- OCLC Symbol: HATHI
- Holdings Format: Print
| Materials | Archive Action | Date of Action | Program | Status/Note |
|---|---|---|---|---|
|
no.1 1925; no.2 1930; no.3 1930; no.4 1931; no.5 1938; no.6 1946; no.7 1948
|
committed to retain | 2021-01-01 | HTDL |
|