| Duncan, William; ISMA Directory; 1906 | ISMA Directory | 1906-00-00 | GEBHARDT, A. | Captain |
| Duncan, William; ISMA Directory; 1907 | ISMA Directory | 1907-00-00 | GEBHARDT | Captain |
| Duncan, William; ISMA Directory; 1908 | ISMA Directory | 1908-00-00 | GEBHARDT | Captain |
| Duncan, William; ISMA Directory; 1909 | ISMA Directory | 1909-00-00 | THEW, W.P. | Captain |
| Duncan, William; ISMA Directory; 1912 | ISMA Directory | 1912-00-00 | MIAMI | Captain |
| Duncan, William; ISMA Directory; 1913 | ISMA Directory | 1913-00-00 | MIAMI | Captain |
| Duncan, William; ISMA Directory; 1918 | ISMA Directory | 1918-00-00 | OWEN, GEORGE B. | Captain |