| http://www.w3.org/ns/prov#value | - Single-signed Hall of Fame balls include those autographed by Warren Giles, Chuck Klein, Ed Walsh, Bill Klem, Tom Connolly Willie Wells, Hilton Smith, Elmer Flick, Tris Speaker, Harry Hooper, Chick Hafey, and Sam Crawford, in addition to spectacular high-grade examples of Babe Ruth and Ty Cobb.
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