Babe Ruth & Lou Gehrig Dual Signed 1920's Official American League Baseball PSA
June 3, 1932: Lou Gehrig hits four home runs, Tony Lazzeri hits for natural cycle - Pinstripe Alley
A baseball mystery: Did a teenage girl really strike out Babe Ruth and Lou Gehrig? - The Washington Post
Lou Gehrig and Babe Ruth — Calisphere
Robert Edward Auctions - The Premiere Sports Auction House
Gehrig vs. Ruth, 1927” Home Run Race
Babe Ruth Lou Gehrig 1923 by Transcendental Graphics
Babe Ruth & Lou Gehrig Dual Signed 1920's Official American League Baseball PSA
Lou Gehrig Facts