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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mackey, Cloyd | 2B | Burlington Bears | 22 | 06/29/1941 | Chicago | USA | Right | Right | 6' 2" | 185 lbs | - |
| Maples, Johnny | SP | La Crosse Lions | 20 | 07/05/1943 | Brooklyn | USA | Switch | Right | 6' 2" | 190 lbs | - |
| Marra, Roy | SP | Burlington Bears | 19 | 11/27/1943 | San Jose | USA | Right | Right | 6' 3" | 190 lbs | - |
| Marshall, Ed | CF | Waterloo Chiefs | 17 | 10/17/1945 | Chicago | USA | Right | Left | 5' 9" | 170 lbs | - |
| Martin, Gil | SP | Free Agent | 18 | 03/22/1945 | Wilmington | USA | Switch | Right | 5' 11" | 155 lbs | - |
| Mason, Fred | LF | Free Agent | 22 | 02/27/1941 | Rochester | USA | Left | Left | 6' 0" | 180 lbs | - |
| Masson, Andy | SP | Rock Island Steamboats | 20 | 10/26/1942 | Honolulu | USA | Left | Left | 6' 1" | 195 lbs | - |
| Mathiesen, Eddie | 3B | Rock Island Steamboats | 18 | 08/17/1945 | Detroit | USA | Right | Right | 6' 2" | 190 lbs | - |
| Maxwell, Fred | SS | La Crosse Lions | 18 | 05/11/1945 | Altoona | USA | Switch | Right | 6' 1" | 180 lbs | - |
| McCarty, Bob | SS | Rock Island Steamboats | 16 | 10/14/1946 | Portland | USA | Right | Right | 6' 0" | 170 lbs | - |
| McCauley, Jimmy | CF | Burlington Bears | 17 | 06/01/1946 | Greenbrier | USA | Right | Right | 5' 10" | 160 lbs | - |
| McCormack, Ralph | CF | La Crosse Lions | 20 | 12/23/1942 | Brooklyn | USA | Right | Right | 5' 10" | 185 lbs | - |
| McDaniel, Tom | CL | La Crosse Lions | 17 | 02/21/1946 | Houma | USA | Left | Right | 6' 2" | 180 lbs | - |
| McKinney, George | SP | Quincy Cannoneers | 18 | 06/06/1945 | Philadelphia | USA | Right | Right | 6' 6" | 190 lbs | - |
| Menezes, Jack | LF | St. Cloud Lumberjacks | 20 | 12/07/1942 | Chicago | USA | Right | Right | 5' 11" | 210 lbs | - |
| Messer, Rube | 1B | Quincy Cannoneers | 18 | 11/29/1944 | New York | USA | Left | Right | 6' 1" | 205 lbs | - |
| Messner, Pat | SS | Moline Pioneers | 18 | 08/30/1945 | Chicago | USA | Left | Right | 6' 2" | 185 lbs | - |
| Miller, Bob | LF | Waterloo Chiefs | 21 | 09/21/1942 | Clinton | USA | Left | Right | 6' 2" | 190 lbs | - |
| Miller, Don | C | La Crosse Lions | 21 | 03/16/1942 | Albany | USA | Left | Right | 6' 2" | 200 lbs | - |
| Miller, Marv | 3B | Dubuque Dukes | 20 | 01/13/1943 | Baltimore | USA | Right | Right | 5' 10" | 200 lbs | - |
| Monteagudo, Ivan | C | Burlington Bears | 19 | 11/03/1943 | San Juan | PUR | Right | Right | 5' 11" | 195 lbs | - |
| Moon, Alex | RF | Rock Island Steamboats | 17 | 01/22/1946 | Pittsburg | USA | Right | Right | 5' 10" | 170 lbs | - |
| Moore, Nick | SS | Waterloo Chiefs | 18 | 09/23/1945 | Nashville | USA | Right | Right | 6' 0" | 165 lbs | - |
| Morrison, Chief | 1B | La Crosse Lions | 20 | 06/06/1943 | Montclair | USA | Right | Right | 6' 0" | 215 lbs | - |
| Morrison, Irv | 2B | Free Agent | 22 | 02/05/1941 | Cleveland | USA | Right | Right | 5' 10" | 175 lbs | - |
| Moss, Al | CF | St. Cloud Lumberjacks | 20 | 07/20/1943 | Buffalo | USA | Left | Left | 6' 1" | 200 lbs | - |
| Moss, Tom | 2B | Quincy Cannoneers | 19 | 08/21/1944 | Fond du Lac | USA | Right | Right | 5' 11" | 175 lbs | - |
| Muller, Jesse | SP | Ottumwa Owls | 20 | 01/14/1943 | Mobile | USA | Right | Right | 6' 0" | 175 lbs | - |
| Mullins, Bunny | SP | Rock Island Steamboats | 19 | 07/23/1944 | Jackson | USA | Right | Right | 6' 4" | 195 lbs | - |
| Mullins, Jack | C | St. Cloud Lumberjacks | 19 | 09/03/1944 | Dayton | USA | Right | Right | 6' 2" | 195 lbs | - |
