| Spencer, Willis B.; ISMA Directory; 1921 | ISMA Directory | 1921-00-00 | | Captain |
| Spencer, Willis B.; ISMA Directory; 1922 | ISMA Directory | 1922-00-00 | | Captain |
| Spencer, Willis B.; ISMA Directory; 1923 | ISMA Directory | 1923-00-00 | | Captain |
| Spencer, Willis B.; ISMA Directory; 1937 | ISMA Directory | 1937-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1938 | ISMA Directory | 1938-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1939 | ISMA Directory | 1939-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1940 | ISMA Directory | 1940-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1941 | ISMA Directory | 1941-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1942 | ISMA Directory | 1942-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1943 | ISMA Directory | 1943-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1944 | ISMA Directory | 1944-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1945 | ISMA Directory | 1945-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1946 | ISMA Directory | 1946-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1947 | ISMA Directory | 1947-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1948 | ISMA Directory | 1948-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1949 | ISMA Directory | 1949-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1950 | ISMA Directory | 1950-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1951 | ISMA Directory | 1951-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1952 | ISMA Directory | 1952-00-00 | | |
| Spencer, Willis B.; ISMA Directory; 1953 | ISMA Directory | 1953-00-00 | | |