| Holtorf, M.; 1983 Red Book; 1983 | 1983 Red Book | 1983-00-00 | IMPERIAL ACADIA | Chief Engineer |
| Holtorf, M.; 1984 Red Book; 1984 | 1984 Red Book | 1984-00-00 | IMPERIAL ACADIA | Chief Engineer |
| Holtorf, M.; 1985 Red Book; 1985 | 1985 Red Book | 1985-00-00 | IMPERIAL ACADIA | Chief Engineer |
| Holtorf, M.; 1986 Red Book; 1986 | 1986 Red Book | 1986-00-00 | IMPERIAL BEDFORD | Chief Engineer |
| Holtorf, M.; 1987 Red Book; 1987 | 1987 Red Book | 1987-00-00 | IMPERIAL BEDFORD | Chief Engineer |
| Holtorf, M.; 1988 Lake Boats; 1988 | 1988 Lake Boats | 1988-00-00 | IMPERIAL BEDFORD | Chief Engineer |