| Plaar, Mark F.; 1944 Red Book; 1944 | 1944 Red Book | 1944-00-00 | THE HARVESTER | Captain |
| Plaar, Mark F.; Great Lake Review 4/42; 1942 | Great Lake Review 4/42 | 1942-00-00 | THE INTERNATIONAL | First Mate |
| Plaar, Mark F.; Great Lakes News 2/44; 1944 | Great Lakes News 2/44 | 1944-00-00 | THE HARVESTER | Captain |
| Plaar, Mark F.; Great Lakes News 2/44; 1944 | Great Lakes News 2/44 | 1944-00-00 | | Itakia |
| Plaar, Mark F.; Great Lakes News 5/39; 1939 | Great Lakes News 5/39 | 1939-00-00 | HARVESTER | First Mate |
| Plaar, Mark F.; Great Lakes News 5/39; 1939 | Great Lakes News 5/39 | 1939-00-00 | INTERNATIONAL | First Mate |
| Plaar, Mark F.; Great Lakes News 6/43; 1943 | Great Lakes News 6/43 | 1943-00-00 | THE INTERNATIONAL | First Mate |
| Plaar, Mark F.; Great Lakes Review 11/43; 1943 | Great Lakes Review 11/43 | 1943-00-00 | THE INTERNATIONAL | Captain |