| Location | Source | Date | Page | Caption | Uniform | Type |
|---|---|---|---|---|---|---|
| 2000 CUPS OF COFFEE, Marc Okkonen (unpublished) | 2007 draft | 148 | McMahon, Henry John | Boston AL | Throwing action - upper body view | |
| Boston Globe | Aug. 31, 1908 | 5 | H. J. McMahon | Boston AL | Throwing action - full length view | |
| Lefty Blasco Collection (from a newspaper) | c. 1908 | Holy Cross Baseball Squad | Holy Cross College | Team |