References:
PSA Pop Report, 1971 O-Pee-Chee: www.psacard.com/pop/baseball-...
PSA Pop Report, 1971 Topps: www.psacard.com/pop/baseball-...
Dean’s Cards on 1971 O-Pee-Chee:
www.deanscards.com/c/736/1971...
blog.deanscards.com/2011/02/o-...
PSA on 1971 O-Pee-Chee: www.psacard.com/cardfacts/bas...
Net54 Discussion of 1971 O-Pee-Chee: www.net54baseball.com/archive...
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