The Baseball Hall of Fame had a press release on their website about this: http://baseballhall....ll-referencecom
Here's an excerpt from the press release:
The study includes sanctioned league game box scores from almost 100 percent of games played in the 1920s, in excess of 90 percent of the box scores from games played in the 1930s and box scores from 50-70 percent of games played in the 1940s and 50s, during which time the various leagues began to disband and newspapers ceased to report game information. The end result is the most comprehensive compilation of statistics on the Negro Leagues that has ever been accumulated.
I imagine that DennisJames and redeck could have used this information when they were developing their Negro League mods!