| Robertson, Charles; ISMA Directory; 1910 | ISMA Directory | 1910-00-00 | ANN ARBOR NO. 1 | Captain |
| Robertson, Charles; ISMA Directory; 1912 | ISMA Directory | 1912-00-00 | ANN ARBOR NO. 3 | Captain |
| Robertson, Charles; ISMA Directory; 1913 | ISMA Directory | 1913-00-00 | ANN ARBOR NO. 5 | Captain |
| Robertson, Charles; ISMA Directory; 1914 | ISMA Directory | 1914-00-00 | ANN ARBOR 3 | Captain |
| Robertson, Charles; ISMA Directory; 1916 | ISMA Directory | 1916-00-00 | MCKINSTRY, A.E. | Captain |
| Robertson, Charles; ISMA Directory; 1917 | ISMA Directory | 1917-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1918 | ISMA Directory | 1918-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1919 | ISMA Directory | 1919-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1920 | ISMA Directory | 1920-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1921 | ISMA Directory | 1921-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1922 | ISMA Directory | 1922-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1923 | ISMA Directory | 1923-00-00 | PERE MARQUETTE 19 | Captain |
| Robertson, Charles; ISMA Directory; 1926 | ISMA Directory | 1926-00-00 | PERE MARQUETTE 21 | Captain |
| Robertson, Charles; ISMA Directory; 1927 | ISMA Directory | 1927-00-00 | PERE MARQUETTE 21 | Captain |
| Robertson, Charles; ISMA Directory; 1928 | ISMA Directory | 1928-00-00 | PERE MARQUETTE 21 | Captain |
| Robertson, Charles; ISMA Directory; 1929 | ISMA Directory | 1929-00-00 | PERE MARQUETTE 21 | Captain |
| Robertson, Charles; ISMA Directory; 1931 | ISMA Directory | 1931-00-00 | CITY OF SAGINAW 32 | Captain |