Retrosheet provided many of the MLB scores.

Steven Joy has been correcting locations and scores for the NBA since 2010.

The majority of the college football scores came from this page at James Howell's site.

College football overtime information before the 2003 season came from Scott Ferrell.

College basketball scores since the 1995-96 season came from Ken Pomeroy.
Regular season college basketball scores before that came from this site.

Some conference affiliations came from: here.

Canadian Football League info came from:
Official Canadian Football League site
CFL Statistics Database

Arena Football information before 2007 came from:

ABA information came from:
Remember the ABA
Steve Dimitry's ABA Web Page
ABA History

The NHL scores before 1983-84 came from Jeff Wood and Stu McMurray of the Hockey Summary Project group on Yahoo.