Zach Wheat in 1910 with Brooklyn
He even signed it "Buck Wheat"
Al Burch (1910 Brooklyn)
Art Thomason (Cleveland Indians in 1910) Shown here with Lincoln in 1917. Also signed.
I haven't been able to figure out this guy yet, but he was friends with Bill Davidson and this was glued into the scrapbook right next to Burch and Wheat.
Still trying to figure out this guy too. Played for the 1906 Indianapolis Indians and signed the card "Will". There was a William Kelly who played on that team, but The Baseball Register doesn't know the identity of the player.