Rob M.,
Those scorecards are really impressive !!! I am a collector of basketball memorabilia, especially the vintage stuff, but I don't have too much early stuff, since I can't really afford the good stuff plus it's hard to find anyway.
I did a lot of early basketball research some years ago. As a matter of fact, I was a huge TTM autograph collector at the time & used to compile & sell a basketball address list. I tracked guys down who used to play in the NBL, BAA, Eastern League, etc,... and wrote to them for autographs.
I suggest you join APBR and its related message board to correspond to others who are researchers & enthusiasts of early basketball.
http://apbr.org/