September 26, 1981: Nolan Ryan breaks Koufax's mark with fifth no-hitter – Society for American Baseball Research
2021 UCLA Baseball Information Guide by UCLA Athletics - Issuu
Does it surprise you that Nolan Ryan never pitched a perfect game despite throwing 7 no-hitters? - Quora
Nolan Ryan Sandy Koufax Bob Feller Signed Baseball with COA in Nice Condition
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Looking at pitchers' performances before and after a no-hitter
Big Days in Astros History - September 26, 1981 - Nolan Ryan pitches his fifth no-hitter
Sept. 26, 1981 – Nolan Ryan becomes the first pitcher to throw five no- hitters
PSA Magazine: 2023 April #016 by PSA Magazine - Issuu
Cardboard appreciation: 1981 Topps 1980 NL Championships
Looking at pitchers' performances before and after a no-hitter