| Gronwall, Oscar H.; 1949 Blue Book; 1949 | 1949 Blue Book | 1949-00-00 | DIAMOND ALKALI | Second Mate |
| Gronwall, Oscar H.; 1957 Red Book; 1957 | 1957 Red Book | 1957-00-00 | HARRY YATES | Captain |
| Gronwall, Oscar H.; 1959 Red Book; 1959 | 1959 Red Book | 1959-00-00 | DOW CHEMICAL | Captain |
| Gronwall, Oscar H.; 1960 Red Book; 1960 | 1960 Red Book | 1960-00-00 | HARRIS N. SNYDER | Captain |
| Gronwall, Oscar H.; 1961 Red Book; 1961 | 1961 Red Book | 1961-00-00 | J. S. ASHLEY | Captain |
| Gronwall, Oscar H.; 1962 Red Book; 1962 | 1962 Red Book | 1962-00-00 | J. S. ASHLEY | Captain |
| Gronwall, Oscar H.; 1963 Red Book; 1963 | 1963 Red Book | 1963-00-00 | CONSUMERS POWER | Captain |
| Gronwall, Oscar H.; 1964 Red Book; 1964 | 1964 Red Book | 1964-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, Oscar H.; 1965 Red Book; 1965 | 1965 Red Book | 1965-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, Oscar H.; 1966 Red Book; 1965 | 1966 Red Book | 1965-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, Oscar H.; 1967 Red Book; 1967 | 1967 Red Book | 1967-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, Oscar H.; 1968 Red Book; 1968 | 1968 Red Book | 1968-00-00 | MCKEE SONS | Captain |
| Gronwall, Oscar H.; 1969 Red Book; 1969 | 1969 Red Book | 1969-00-00 | MCKEE SONS | Captain |
| Gronwall, Oscar H.; 1970 Red Book; 1970 | 1970 Red Book | 1970-00-00 | MCKEE SONS | Captain |
| Gronwall, Oscar H.; 1971 Red Book; 1971 | 1971 Red Book | 1971-00-00 | H. LEE WHITE | Captain |
| Gronwall, Oscar H.; 1972 Red Book; 1972 | 1972 Red Book | 1972-00-00 | H. LEE WHITE | Captain |
| Gronwall, Oscar H.; 1973 Red Book; 1973 | 1973 Red Book | 1973-00-00 | H. LEE WHITE | Captain |
| Gronwall, Oscar H.; 1974 Red Book; 1974 | 1974 Red Book | 1974-00-00 | CHARLES E. WILSON | Captain |
| Gronwall, Oscar H.; 1975 ASC Appointment List; 1975 | 1975 ASC Appointment List | 1975-00-00 | CHARLES E. WILSON | Captain |
| Gronwall, Oscar H.; 1976 Red Book; 1976 | 1976 Red Book | 1976-00-00 | DETROIT EDISON | Captain |
| Gronwall, Oscar H.; 1977 Red Book; 1977 | 1977 Red Book | 1977-00-00 | DETROIT EDISON | Captain |
| Gronwall, Oscar H.; 1978 Red Book; 1978 | 1978 Red Book | 1978-00-00 | DETROIT EDISON | Captain |
| Gronwall, Oscar H.; 1979 Red Book; 1979 | 1979 Red Book | 1979-00-00 | DETROIT EDISON | Captain |
| Gronwall, Oscar H.; 6/48 Great Lakes Review; 1948 | 6/48 Great Lakes Review | 1948-00-00 | CONSUMERS POWER | Second Mate |
| Gronwall, Oscar H.; Great Lakes Review. 1944 | Great Lakes Review. 1944 | 1944-00-00 | JOHN J. BOLAND | Third Mate |