| Zimmer, Gerald E.; 1973 Red Book; 1973 | 1973 Red Book | 1973-00-00 | SAMUEL MATHER | Chief Engineer |
| Zimmer, Gerald E.; 1974 Red Book; 1974 | 1974 Red Book | 1974-00-00 | FRANK ARMSTRONG | Chief Engineer |
| Zimmer, Gerald E.; 1975 Red Book; 1975 | 1975 Red Book | 1975-00-00 | FRANK ARMSTRONG | Chief Engineer |
| Zimmer, Gerald E.; 1976 Red Book; 1976 | 1976 Red Book | 1976-00-00 | HERBERT C. JACKSON | Chief Engineer |
| Zimmer, Gerald E.; 1977 Red Book; 1977 | 1977 Red Book | 1977-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1978 Red Book; 1978 | 1978 Red Book | 1978-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1979 Red Book; 1979 | 1979 Red Book | 1979-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1980 Red Book; 1980 | 1980 Red Book | 1980-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1981 Red Book; 1981 | 1981 Red Book | 1981-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1983 Red Book; 1983 | 1983 Red Book | 1983-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1985 Red Book; 1985 | 1985 Red Book | 1985-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1986 Red Book; 1986 | 1986 Red Book | 1986-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1988 Lake Boats; 1988 | 1988 Lake Boats | 1988-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; 1989 Lake Boats; 1989 | 1989 Lake Boats | 1989-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; Interlake Log July 1948 | Interlake Log July 1948 | 1948-00-00 | CALUMET | Third Assistant |
| Zimmer, Gerald E.; Interlake Log May 1950 | Interlake Log May 1950 | 1950-00-00 | YOUNGSTOWN | Third Assistant |
| Zimmer, Gerald E.; Interlake Log May 1952 | Interlake Log May 1952 | 1952-00-00 | HARVEY H. BROWN | Second Assistant |
| Zimmer, Gerald E.; Interlake Log May 1960 | Interlake Log May 1960 | 1960-00-00 | | First Assistant |
| Zimmer, Gerald E.; Interlake Log September 1956 | Interlake Log September 1956 | 1956-00-00 | VERONA | First Assistant |
| Zimmer, Gerald E.; Interlake Log Summer 1984 | Interlake Log Summer 1984 | 1984-00-00 | MESABI MINER | Chief Engineer |
| Zimmer, Gerald E.; Interlake Log Winter 1958 | Interlake Log Winter 1958 | 1958-00-00 | | First Assistant |
| Zimmer, Gerald E.; LCA Bulletin 5/48; 1948 | LCA Bulletin 5/48 | 1948-00-00 | | Oiler |