| McElroy, W. P.; ISMA Directory; 1907 | ISMA Directory | 1907-00-00 | CAMBRIA | Captain |
| McElroy, W. P.; ISMA Directory; 1908 | ISMA Directory | 1908-00-00 | MARITANA | Captain |
| McElroy, W. P.; ISMA Directory; 1909 | ISMA Directory | 1909-00-00 | SIEMENS, SIR WILLIAM | Captain |
| McElroy, W. P.; ISMA Directory; 1910 | ISMA Directory | 1910-00-00 | SIEMENS, SIR WILLIAM | Captain |
| McElroy, W. P.; ISMA Directory; 1911 | ISMA Directory | 1911-00-00 | SIEMENS | Captain |
| McElroy, W. P.; ISMA Directory; 1912 | ISMA Directory | 1912-00-00 | MORSE, SAMUEL F.B. | Captain |
| McElroy, W. P.; ISMA Directory; 1913 | ISMA Directory | 1913-00-00 | MORSE | Captain |
| McElroy, W. P.; ISMA Directory; 1914 | ISMA Directory | 1914-00-00 | MORSE | Captain |
| McElroy, W. P.; ISMA Directory; 1916 | ISMA Directory | 1916-00-00 | COREY, W.E. | Captain |
| McElroy, W. P.; ISMA Directory; 1920 | ISMA Directory | 1920-00-00 | OLCOTT, WILLIAM J. | Captain |
| McElroy, W. P.; ISMA Directory; 1921 | ISMA Directory | 1921-00-00 | KERR | Captain |
| McElroy, W. P.; ISMA Directory; 1922 | ISMA Directory | 1922-00-00 | KERR | Captain |
| McElroy, W. P.; ISMA Directory; 1923 | ISMA Directory | 1923-00-00 | KERR, D.G. | Captain |
| McElroy, W. P.; ISMA Directory; 1926 | ISMA Directory | 1926-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1927 | ISMA Directory | 1927-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1928 | ISMA Directory | 1928-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1929 | ISMA Directory | 1929-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1931 | ISMA Directory | 1931-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1932 | ISMA Directory | 1932-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1933 | ISMA Directory | 1933-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1934 | ISMA Directory | 1934-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1935 | ISMA Directory | 1935-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1936 | ISMA Directory | 1936-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1937 | ISMA Directory | 1937-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1938 | ISMA Directory | 1938-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1939 | ISMA Directory | 1939-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1940 | ISMA Directory | 1940-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1941 | ISMA Directory | 1941-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1942 | ISMA Directory | 1942-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1943 | ISMA Directory | 1943-00-00 | | |
| McElroy, W. P.; ISMA Directory; 1944 | ISMA Directory | 1944-00-00 | | |