| Jacobsen, Jacob; ISMA Directory; 1923 | ISMA Directory | 1923-00-00 | | Captain |
| Jacobsen, Jacob; ISMA Directory; 1924 | ISMA Directory | 1924-00-00 | | Captain |
| Jacobsen, Jacob; ISMA Directory; 1925 | ISMA Directory | 1925-00-00 | | Captain |
| Jacobsen, Jacob; ISMA Directory; 1926 | ISMA Directory | 1926-00-00 | | Captain |
| Jacobsen, Jacob; ISMA Directory; 1927 | ISMA Directory | 1927-00-00 | | Captain |
| Jacobsen, Jacob; ISMA Directory; 1937 | ISMA Directory | 1937-00-00 | | |
| Jacobsen, Jacob; ISMA Directory; 1938 | ISMA Directory | 1938-00-00 | | |
| Jacobsen, Jacob; ISMA Directory; 1939 | ISMA Directory | 1939-00-00 | | |
| Jacobsen, Jacob; ISMA Directory; 1940 | ISMA Directory | 1940-00-00 | | |
| Jacobsen, Jacob; ISMA Directory; 1941 | ISMA Directory | 1941-00-00 | | |
| Jacobsen, Jacob; ISMA Directory; 1942 | ISMA Directory | 1942-00-00 | | |