| Hartl, Sylvester F.; 1949 Blue Book; 1949 | 1949 Blue Book | 1949-00-00 | A. T. KINNEY | Second Assistant |
| Hartl, Sylvester F.; Great Lakes News 4/45; 1945 | Great Lakes News 4/45 | 1945-00-00 | FRANK E. TAPLIN | Second Assistant |
| Hartl, Sylvester F.; Great Lakes News 7/43; 1943 | Great Lakes News 7/43 | 1943-00-00 | THOMAS WILSON | Third Assistant |
| Hartl, Sylvester F.; Great Lakes Review. 1944 | Great Lakes Review. 1944 | 1944-00-00 | KICKAPOO | Second Assistant |
| Hartl, Sylvester F.; LCA Bulletin 5/42; 1942 | LCA Bulletin 5/42 | 1942-00-00 | S. H. ROBBINS | Oiler |