| Dupont Jr., John; 1930 Blue Book; 1930 | 1930 Blue Book | 1930-00-00 | MARICOPA | First Assistant |
| Dupont Jr., John; 1931 Blue Book; 1931 | 1931 Blue Book | 1931-00-00 | PERCIVAL ROBERTS JR. | Second Asistant |
| Dupont Jr., John; 1937 Blue Book; 1937 | 1937 Blue Book | 1937-00-00 | ZENITH CITY | First Assistant |
| Dupont Jr., John; Lake Carriers Bulletin October 1924 | Lake Carriers Bulletin October 1924 | 1924-00-00 | SIR HENRY BESSEMER | Second Assistant |
| Dupont Jr., John; LCA Bulletin June 1924 | LCA Bulletin June 1924 | 1924-00-00 | SIR WILLIAM SIEMENS | Second Assistant |
| Dupont Jr., John; LCA Bulletin May 1924 | LCA Bulletin May 1924 | 1924-00-00 | FRANK ROCKERFELLER | Oiler |