| Gentz, Otto A.; 1912 Red Book; 1912 | 1912 Red Book | 1912-00-00 | JOHN OWEN | Captain |
| Gentz, Otto A.; 1913 Red Book; 1913 | 1913 Red Book | 1913-00-00 | JOHN OWEN | Captain |
| Gentz, Otto A.; 1914 Red Book; 1914 | 1914 Red Book | 1914-00-00 | JOHN OWEN | Captain |
| Gentz, Otto A.; 1915 Red Book; 1915 | 1915 Red Book | 1915-00-00 | JOHN OWEN | Captain |
| Gentz, Otto A.; 1916 Green's | 1916 Green's | | D. Z. NORTON | Captain |
| Gentz, Otto A.; 1917 Red Book; 1917 | 1917 Red Book | 1917-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; 1918 Red Book; 1918 | 1918 Red Book | 1918-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; 1920 Red Book; 1920 | 1920 Red Book | 1920-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; 1921 Red Book; 1921 | 1921 Red Book | 1921-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; 1923 Red Book; 1923 | 1923 Red Book | 1923-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; 1924 Red Book; 1924 | 1924 Red Book | 1924-00-00 | WILLIAM LOVONGSTONE | Captain |
| Gentz, Otto A.; 1925 Red Book; 1925 | 1925 Red Book | 1925-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; 1926 Red Book | 1926 Red Book | | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1927 Red Book; 1927 | 1927 Red Book | 1927-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1928 Red Book; 1928 | 1928 Red Book | 1928-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1929 Red Book; 1929 | 1929 Red Book | 1929-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1930 Red Book; 1930 | 1930 Red Book | 1930-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1931 Red Book; 1931 | 1931 Red Book | 1931-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1932 Red Book; 1932 | 1932 Red Book | 1932-00-00 | C. RUSSELL HUBBARD | Captain |
| Gentz, Otto A.; 1936 Red Book; 1936 | 1936 Red Book | 1936-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1937 Red Book; 1937 | 1937 Red Book | 1937-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; 1938 Red Book; 1938 | 1938 Red Book | 1938-00-00 | J. CLARE MILLER | Captain |
| Gentz, Otto A.; Great Lakes News 12/43; 1943 | Great Lakes News 12/43 | 1943-00-00 | WILLIAM LIVINGSTONE | Captain |
| Gentz, Otto A.; Great Lakes News 2/45; 1945 | Great Lakes News 2/45 | 1945-00-00 | BLACKHAWK | seaman |
| Gentz, Otto A.; Great Lakes News 2/45; 1945 | Great Lakes News 2/45 | 1945-00-00 | | Second Mate |
| Gentz, Otto A.; Great Lakes News 4/40; 1940 | Great Lakes News 4/40 | 1940-00-00 | JOSEPH H. FRANTZ | Captain |
| Gentz, Otto A.; Great Lakes News 5/40; 1940 | Great Lakes News 5/40 | 1940-00-00 | SAMUEL MITCHELL | Wheelsman |
| Gentz, Otto A.; Great Lakes News 5/40; 1940 | Great Lakes News 5/40 | 1940-00-00 | JOHN OWEN | Captain |
| Gentz, Otto A.; Great Lakes News 9/43; 1943 | Great Lakes News 9/43 | 1943-00-00 | | Fleet Captain |
| Gentz, Otto A.; LCA Bulletin August, 1939 | LCA Bulletin August, 1939 | 1939-00-00 | S. B. WAY | Captain |