Babe Ruth, Lou Gehrig signed baseball heads Memory Lane auction
Babe Ruth - Sports Collectors Digest
Detroit Tigers - Wikipedia
Babe Ruth – Society for American Baseball Research
Babe Ruth items dominate Memory Lane auction - Sports Collectors
Robert Edward Auctions - The Premiere Sports Auction House
1947 Ruth Gem Mint 10 Autographed Baseball, Thousands of Cardboard
1995–2010 – SABR's Baseball Cards Research Committee
Babe Ruth, Lou Gehrig signed baseball heads Memory Lane auction
1995–2010 – SABR's Baseball Cards Research Committee
1995–2010 – SABR's Baseball Cards Research Committee