The blue book contractors register :
- Publisher: Contractors Register, Inc.
- Print ISSN: 0734-4457
- Electronic ISSN: 0734-4457
- OCLC Number: 7625897
- Subject: Contractors Washington Metropolitan Area Directories.
- Subject code: T
- Publication history: 1972-1987.
Print Holdings
| Archiving Institution | Program | Holdings Description | Retention |
|---|---|---|---|
| HathiTrust (HATHI) | HTDL | 1987 | permanent |