Best Forum or Website for vintage autos?

I'm helping a friend track down autos (preferably single-signed baseballs) from each of the 1950 Philadelphia Phillies. Some of the players are easy, but others are quite tough. I'm sure there must be a couple of forums or websites populated by people that can help. Can anyone point me in the right direction?
Thanks!
Drew
Thanks!
Drew
0
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Costs $15 per year to join.
Shane