1971 Topps Baseball Card Checklist – Vintage Review – – Sports Card Radio
1983 San Francisco Giants Baseball Trading Cards - Baseball Cards by RCBaseballCards
Jack Clark Trading Cards: Values, Tracking & Hot Deals
Team: San Francisco Giants. This is simply an indentifier I use to locate the card, and the SKU letter does not have any impact on the card itself.
1983 Topps Jack Clark #210 NM/MT or Better San Francisco Giants
Jack Clark Gallery Trading Card Database
Jack the Ripper Clark: 4x All-Star, 2x Silver Slugger - Italian Americans in Baseball
1983 San Francisco Giants Baseball Trading Cards - Baseball Cards by RCBaseballCards
Calaméo - REA Fall 2015
Topps – Page 4 – SABR's Baseball Cards Research Committee
San Francisco Giants Sports Cards Values - GoCollect (san-francisco-giants , page 12)
Michael Wm. Kaluta Checklist — GLIMMER GRAPHICS PRINTS
1983 Topps Baseball Cards — The Ultimate Guide, by Moonlighting Writer