Directory of libraries and information sources.
- Publisher:
- Print ISSN:
- Electronic ISSN:
- OCLC Number: 2465192
- Subject: Libraries Pennsylvania Philadelphia.
- Subject code: Z
- Publication history: [1st,3d]- ed; 1920, 1923-
Print Holdings
| Archiving Institution | Program | Holdings Description | Retention |
|---|---|---|---|
| HathiTrust (HATHI) | HTDL | v.9 1956; v.10 1960; v.11 1964; v.12 1968; v.21 1993 | permanent |