| Gowan, Richard W.; ISMA Directory; 1952 | ISMA Directory | 1952-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1953 | ISMA Directory | 1953-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1954 | ISMA Directory | 1954-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1955 | ISMA Directory | 1955-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1956 | ISMA Directory | 1956-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1971 | ISMA Directory | 1971-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1973 | ISMA Directory | 1973-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1976 | ISMA Directory | 1976-00-00 | | Captain |
| Gowan, Richard W.; ISMA Directory; 1980 | ISMA Directory | 1980-00-00 | | Captain |