Sold at Auction: Possibly Re-Colored EX 1975 Topps George Brett Rookie #228 Baseball Card - HOf
1975 George Brett Baseball Cards for sale
PSA Magazine: 2023 April #016 by PSA Magazine - Issuu
1975 Topps Mini George Brett
What was a 1952 Topps Mickey Mantle card worth in the 70's before baseball card collecting really took off? - Quora
1975 Topps Baseball set sells for $600K; record sales at Goldin point to health of hobby - Sports Collectors Digest
Card-iac Kid: Uni Watch Founder to Get Topps Treatment
John Racanelli – SABR's Baseball Cards Research Committee
Auction Prices Realized Baseball Cards 1975 Topps George Brett