| Holt, Robert A.; 1929 Red Book; 1929 | 1929 Red Book | 1929-00-00 | JOHN MCCARTNEY KENNEDY | Chief Engineer |
| Holt, Robert A.; 1930 Red Book; 1930 | 1930 Red Book | 1930-00-00 | JOHN MCCARTNEY KENNEDY | Chief Engineer |
| Holt, Robert A.; 1931 Red Book; 1931 | 1931 Red Book | 1931-00-00 | JOHN MCCARTNEY KENNEDY | Chief Engineer |
| Holt, Robert A.; 1932 Red Book; 1932 | 1932 Red Book | 1932-00-00 | JOHN MCCARTNEY KENNEDY | Chief Engineer |
| Holt, Robert A.; 1933 Red Book; 1933 | 1933 Red Book | 1933-00-00 | JOHN MCCARTNEY KENNEDY | Chief Engineer |
| Holt, Robert A.; 1934 Red Book; 1934 | 1934 Red Book | 1934-00-00 | WILLIAM NELSON | Chief Engineer |
| Holt, Robert A.; 1935 Red Book; 1935 | 1935 Red Book | 1935-00-00 | WILLIAM NELSON | Chief Engineer |
| Holt, Robert A.; 1936 Red Book; 1936 | 1936 Red Book | 1936-00-00 | WILLIAM NELSON | Chief Engineer |
| Holt, Robert A.; 1937 Red Book; 1937 | 1937 Red Book | 1937-00-00 | BEN E. TATE | Chief Engineer |
| Holt, Robert A.; Great Lakes News 5/42; 1942 | Great Lakes News 5/42 | 1942-00-00 | COLONEL JAMES M. SCHOONMAKER | Third Assistant |