| Zwack, Herbert D.; Cliffs Seniority List 5/28/75; 1975 | Cliffs Seniority List 5/28/75 | 1975-00-00 | CADILLAC | Oiler |
| Zwack, Herbert D.; Cliffs Seniority list 6/15/81; 1981 | Cliffs Seniority list 6/15/81 | 1981-00-00 | CADILLAC | Oiler |
| Zwack, Herbert D.; Cliffs Seniority list 6/26/80; 1980 | Cliffs Seniority list 6/26/80 | 1980-00-00 | | |
| Zwack, Herbert D.; Cliffs Seniority list 6/26/80; 1980 | Cliffs Seniority list 6/26/80 | 1980-00-00 | CADILLAC | Oiler |
| Zwack, Herbert D.; Cliffs Seniority list 7/15; 1915 | Cliffs Seniority list 7/15 | 1915-00-00 | WALTER A. STERLING | wiper |
| Zwack, Herbert D.; Cliffs Seniority list 7/15; 1915 | Cliffs Seniority list 7/15 | 1915-00-00 | WALTER A. STERLING | gateman |
| Zwack, Herbert D.; Cliffs Seniority list October 1977 | Cliffs Seniority list October 1977 | 1977-00-00 | CADILLAC | Oiler |
| Zwack, Herbert D.; pc J. Clark | pc J. Clark | | CADILLAC | Oiler |
| Zwack, Herbert D.; pc J. Clark | pc J. Clark | | CADILLAC | Oiler |
| Zwack, Herbert D.; pc J. Clark | pc J. Clark | | CADILLAC | Oiler |