| Gronwall, H. Peter; 1949 Blue Book; 1949 | 1949 Blue Book | 1949-00-00 | SINALOA | Second Mate |
| Gronwall, H. Peter; 1966 Red Book; 1965 | 1966 Red Book | 1965-00-00 | FRED A. MANSKE | Captain |
| Gronwall, H. Peter; 1967 Red Book; 1967 | 1967 Red Book | 1967-00-00 | FRED A. MANSKE | Captain |
| Gronwall, H. Peter; 1968 Red Book; 1968 | 1968 Red Book | 1968-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, H. Peter; 1969 Red Book; 1969 | 1969 Red Book | 1969-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, H. Peter; 1970 Red Book; 1970 | 1970 Red Book | 1970-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, H. Peter; 1971 Red Book; 1971 | 1971 Red Book | 1971-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, H. Peter; 1972 Red Book; 1972 | 1972 Red Book | 1972-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, H. Peter; 1973 Red Book; 1973 | 1973 Red Book | 1973-00-00 | DIAMOND ALKALI | Captain |
| Gronwall, H. Peter; 1974 Red Book; 1974 | 1974 Red Book | 1974-00-00 | ADAM E. CORNELIUS | Captain |
| Gronwall, H. Peter; 1975 ASC Appointment List; 1975 | 1975 ASC Appointment List | 1975-00-00 | ADAM E. CORNELIUS | Captain |
| Gronwall, H. Peter; 1976 Red Book; 1976 | 1976 Red Book | 1976-00-00 | ADAM E. CORNELIUS | Captain |
| Gronwall, H. Peter; 1977 Red Book; 1977 | 1977 Red Book | 1977-00-00 | ST. CLAIR | Captain |
| Gronwall, H. Peter; 1978 Red Book; 1978 | 1978 Red Book | 1978-00-00 | BELLE RIVER | Captain |
| Gronwall, H. Peter; 1979 Red Book; 1979 | 1979 Red Book | 1979-00-00 | BELLE RIVER | Captain |
| Gronwall, H. Peter; 1980 Red Book; 1980 | 1980 Red Book | 1980-00-00 | BELLE RIVER | Captain |
| Gronwall, H. Peter; 1981 Red Book; 1981 | 1981 Red Book | 1981-00-00 | BELLE RIVER | Captain |
| Gronwall, H. Peter; 1982 Red Book; 1982 | 1982 Red Book | 1982-00-00 | ST. CLAIR | Captain |
| Gronwall, H. Peter; 1983 Red Book; 1983 | 1983 Red Book | 1983-00-00 | ST. CLAIR | Captain |
| Gronwall, H. Peter; 1984 Red Book; 1984 | 1984 Red Book | 1984-00-00 | ST. CLAIR | Captain |
| Gronwall, H. Peter; 1985 T'giving Menu; 1985 | 1985 T'giving Menu | 1985-00-00 | ST. CLAIR | Captain |
| Gronwall, H. Peter; 1986 Red Book; 1986 | 1986 Red Book | 1986-00-00 | ST. CLAIR | Captain |
| Gronwall, H. Peter; 1987 Red Book; 1987 | 1987 Red Book | 1987-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; 1988 Lake Boats; 1988 | 1988 Lake Boats | 1988-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; 1995 Lake Boats; 1995 | 1995 Lake Boats | 1995-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; 6/48 Great Lakes Review; 1948 | 6/48 Great Lakes Review | 1948-00-00 | GEORGE F. RAND | Third Mate |
| Gronwall, H. Peter; ASC Soundings 11(1)1991 | ASC Soundings 11(1)1991 | 1991-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; ASC Soundings 12(2) 1992 | ASC Soundings 12(2) 1992 | 1992-00-00 | JOHN J. BOLAND | deckhand |
| Gronwall, H. Peter; ASC Soundings 12(2) 1992 | ASC Soundings 12(2) 1992 | 1992-00-00 | CONSUMERS POWER | Watchman |
| Gronwall, H. Peter; ASC Soundings 12(2) 1992 | ASC Soundings 12(2) 1992 | 1992-00-00 | NIAGARA MOHAWK | Captain |
| Gronwall, H. Peter; ASC Soundings 9(2)1989 | ASC Soundings 9(2)1989 | 1989-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; ASC Soundings July 1983 | ASC Soundings July 1983 | 1983-00-00 | BELLE RIVER | Captain |
| Gronwall, H. Peter; ASC Soundings September 1985 | ASC Soundings September 1985 | 1985-00-00 | | First Mate |
| Gronwall, H. Peter; ASC Soundinngs Apr 1990 | ASC Soundinngs Apr 1990 | 1990-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; Lake Boats 1996 | Lake Boats 1996 | 1996-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; Soundings Apr 1993 | Soundings Apr 1993 | 1993-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; Soundings July 1993 | Soundings July 1993 | 1993-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; Soundings June-July 1994 | Soundings June-July 1994 | 1994-00-00 | INDIANA HARBOR | Captain |
| Gronwall, H. Peter; Soundings Mar-Apr 1995 | Soundings Mar-Apr 1995 | 1995-00-00 | CONSUMERS POWER | Wheelsman |
| Gronwall, H. Peter; Soundings Mar-Apr 1995 | Soundings Mar-Apr 1995 | 1995-00-00 | ADAM E. CORNELIUS | Third Mate |
| Gronwall, H. Peter; Soundings Oct 1986 | Soundings Oct 1986 | 1986-00-00 | JOHN J. BOLAND | deckhand |
| Gronwall, H. Peter; Soundings Oct 1986 | Soundings Oct 1986 | 1986-00-00 | INDIANA HARBOR | Captain |