1929 Babe Ruth ball comes with rare video of Babe signing autograph, slugging home run - Sports Collectors Digest
Rare baseball signed by Ruth, Gehrig and Mathewson up for bid in sports/music auction - Sports Collectors Digest
Lot Detail - Babe Ruth Single signed official NL baseball 1929 Yankees BOLD autograph JSA COA
Sell or Auction Your 1929 New York Yankees Signed Autograph Baseball
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Robert Edward Auctions - The Premiere Sports Auction House
Autographs – SABR's Baseball Cards Research Committee
Robert Edward Auctions - The Premiere Sports Auction House
Autographs – SABR's Baseball Cards Research Committee
Rare 1929 Chicago Cubs ball signed by Babe Ruth highlights Huggins & Scott auction - Sports Collectors Digest
1954 -- a Baseball Season by James Kreis - Ebook