Annual report of the director.
- Publisher: Carnegie Institution
- Print ISSN:
- Electronic ISSN:
- OCLC Number: 1553403
- Subject: Geomagnetism.
- Subject code: QC
- Publication history: 1904-
Print Holdings
| Archiving Institution | Program | Holdings Description | Retention |
|---|---|---|---|
| HathiTrust (HATHI) | HTDL | 1907/1908-1912/1913; yr.1913; 1914/1915; 1931-1942; 1956-1957; 1957/1958; 1942-1959; 1955-1962; 1962-1967; 1967-1972; 1972-1976; 1976-1979; 1979-1983 | permanent |