| Ahrens, Erwin C.; 1926 Blue Book; 1926 | 1926 Blue Book | 1926-00-00 | WILLIAM G. MATHER | Second Assistant |
| Ahrens, Erwin C.; 1930 Blue Book; 1930 | 1930 Blue Book | 1930-00-00 | CADILLAC | First Assistant |
| Ahrens, Erwin C.; 1940 Red Book; 1940 | 1940 Red Book | 1940-00-00 | COLONEL | Chief Engineer |
| Ahrens, Erwin C.; 1941 Red Book; 1941 | 1941 Red Book | 1941-00-00 | COLONEL | Chief Engineer |
| Ahrens, Erwin C.; 1942 Red Book; 1942 | 1942 Red Book | 1942-00-00 | COLONEL | Chief Engineer |
| Ahrens, Erwin C.; 1943 Red Book; 1943 | 1943 Red Book | 1943-00-00 | NEGAUNEE | Chief Engineer |
| Ahrens, Erwin C.; 1944 Red Book; 1944 | 1944 Red Book | 1944-00-00 | NEGAUNEE | Chief Engineer |
| Ahrens, Erwin C.; 1945 Red Book; 1945 | 1945 Red Book | 1945-00-00 | NEGAUNEE | Chief Engineer |
| Ahrens, Erwin C.; 1946 Red Book; 1946 | 1946 Red Book | 1946-00-00 | JOLIET | Chief Engineer |
| Ahrens, Erwin C.; 1947 Red Book; 1947 | 1947 Red Book | 1947-00-00 | JOLIET | Chief Engineer |
| Ahrens, Erwin C.; 1950 Red Book; 1950 | 1950 Red Book | 1950-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1951 Red Book; 1951 | 1951 Red Book | 1951-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1952 Red Book; 1952 | 1952 Red Book | 1952-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1953 Red Book; 1953 | 1953 Red Book | 1953-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1954 Red Book; 1954 | 1954 Red Book | 1954-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1955 Red Book; 1955 | 1955 Red Book | 1955-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1956 Red Book; 1956 | 1956 Red Book | 1956-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1957 Red Book; 1957 | 1957 Red Book | 1957-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1959 Red Book; 1959 | 1959 Red Book | 1959-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 1960 Red Book; 1960 | 1960 Red Book | 1960-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; 5/48 Great Lakes Review; 1948 | 5/48 Great Lakes Review | 1948-00-00 | CHAMPLAIN | Chief Engineer |
| Ahrens, Erwin C.; Great Lakes News 10/37; 1937 | Great Lakes News 10/37 | 1937-00-00 | WILLIAM G. MATHER | First Assistant |
| Ahrens, Erwin C.; Great Lakes News 10/37; 1937 | Great Lakes News 10/37 | 1937-00-00 | COLONEL | Chief Engineer |
| Ahrens, Erwin C.; Great Lakes News 1949 | Great Lakes News 1949 | 1949-00-00 | CHAMPLAIN | Chief Engineer |