1969 Billy McCool Game Worn Inaugural Season San Diego Padres

San Diego Padres 1969 first seaon baseball media guide

1969 Topps Baseball Checklist, Team Set Lists, Variations and Key Details

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Tim Jenkins – Page 4 – SABR's Baseball Cards Research Committee

Billy McCool (DD) 1969 San Diego Padres at Wrigley Field Signed 8x10 Photo COA

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It's a Major League City or It Isn't: San Diego's Padres Step Up to the Big Leagues – Society for American Baseball Research

Detailed History Of Padres Star Closers - VAVEL USA

History of the Padres; Volume 1