| Christensen, John; ISMA Directory; 1909 | ISMA Directory | 1909-00-00 | STAFFORD | Captain |
| Christensen, John; ISMA Directory; 1911 | ISMA Directory | 1911-00-00 | STAFFORD | Captain |
| Christensen, John; ISMA Directory; 1912 | ISMA Directory | 1912-00-00 | STAFFORD | Captain |
| Christensen, John; ISMA Directory; 1913 | ISMA Directory | 1913-00-00 | STAFFORD | Captain |
| Christensen, John; ISMA Directory; 1914 | ISMA Directory | 1914-00-00 | STAFFORD | Captain |
| Christensen, John; ISMA Directory; 1916 | ISMA Directory | 1916-00-00 | STAFFORD | Captain |
| Christensen, John; ISMA Directory; 1917 | ISMA Directory | 1917-00-00 | STAFFORD | Captain |