| Wirta, Oscar O. | | | WILLIAM G. MATHER | Chief Engineer |
| Wirta, Oscar O.; Cliffs Assignments 9/18/73; 1973 | Cliffs Assignments 9/18/73 | 1973-00-00 | EDWARD B. GREENE | First Assistant |
| Wirta, Oscar O.; Cliffs News Aug 1975 | Cliffs News Aug 1975 | 1975-00-00 | EDWARD B. GREENE | |
| Wirta, Oscar O.; Cliffs Officer Assignments 12/11; 1911 | Cliffs Officer Assignments 12/11 | 1911-00-00 | CHAMPLAIN | Chief Engineer |
| Wirta, Oscar O.; Cliffs Officers Assignments 3/27/79; 1979 | Cliffs Officers Assignments 3/27/79 | 1979-00-00 | CHAMPLAIN | Chief Engineer |
| Wirta, Oscar O.; Cliffs Officers Assignments 8/26/80; 1980 | Cliffs Officers Assignments 8/26/80 | 1980-00-00 | CHAMPLAIN | First Assistant |
| Wirta, Oscar O.; Cliffs Officers Assignments 8/8/78; 1978 | Cliffs Officers Assignments 8/8/78 | 1978-00-00 | THOMAS F. PATTON | Chief Engineer |
| Wirta, Oscar O.; Cliffs Officers Assignments 9/5/78; 1978 | Cliffs Officers Assignments 9/5/78 | 1978-00-00 | CHAMPLAIN | First Assistant |
| Wirta, Oscar O.; Interlake Log May 1953 | Interlake Log May 1953 | 1953-00-00 | | Oiler |
| Wirta, Oscar O.; LCA Crew List | LCA Crew List | | WILLIAM G. MATHER | Chief Engineer |
| Wirta, Oscar O.; pc J. Scott | pc J. Scott | | CHAMPLAIN | First Assistant |