The Keystone catalog.
- Publisher: Keystone Consolidated Pub. Co.
- Print ISSN:
- Electronic ISSN:
- OCLC Number: 9730506
- Subject: Mining engineering Handbooks, manuals, etc.
- Subject code: T
- Publication history: 6th issue (1926).
Print Holdings
| Archiving Institution | Program | Holdings Description | Retention |
|---|---|---|---|
| HathiTrust (HATHI) | HTDL | issue 6 (1926) | permanent |