| Gregg, Harry J.; 1900 Red Book; 1900 | 1900 Red Book | 1900-00-00 | SPENCER, GEORGE | Chief Engineer |
| Gregg, Harry J.; 1904 Red Book; 1904 | 1904 Red Book | 1904-00-00 | MONROE C. SMITH | Chief Engineer |
| Gregg, Harry J.; 1905 Red Book; 1905 | 1905 Red Book | 1905-00-00 | MONROE C. SMITH | Chief Engineer |
| Gregg, Harry J.; 1906 Red Book; 1906 | 1906 Red Book | 1906-00-00 | MONROE C. SMITH | Chief Engineer |
| Gregg, Harry J.; 1908 Lynn's; 1908 | 1908 Lynn's | 1908-00-00 | A. E. NETTLETON | Chief Engineer |
| Gregg, Harry J.; 1912 Red Book; 1912 | 1912 Red Book | 1912-00-00 | E. J. EARLING | Chief Engineer |
| Gregg, Harry J.; 1913 Red Book; 1913 | 1913 Red Book | 1913-00-00 | E. J. EARLING | Chief Engineer |
| Gregg, Harry J.; 1915 Red Book; 1915 | 1915 Red Book | 1915-00-00 | THE HARVESTER | Chief Engineer |
| Gregg, Harry J.; 1917 Red Book; 1917 | 1917 Red Book | 1917-00-00 | THE HARVESTER | Chief Engineer |
| Gregg, Harry J.; 1918 Red Book; 1918 | 1918 Red Book | 1918-00-00 | THE HARVESTER | Chief Engineer |