Was Jose Valverde throwing spitballs last night? - NBC Sports
Bill Caldwell: Frank Shellenback's spitball kept batters guessing | Local News | joplinglobe.com
MLB Spitball Pitchers | Baseball Almanac
Baseball's Gaylord Perry dies; Cy Young winner, spitball king - Los Angeles Times
Jose Valverde's 'spitball' clip goes viral, raises more questions than answers
Center Field on Fire: An Umpire's Life... by Phillips, Dave
Spitball - Wikipedia
A gripping saga: 11 tales of pitchers using spitters, sandpaper and scuffing - Sports Illustrated
What is a Spitball in Baseball? Why it is Illegal in Baseball? - NISR
Marlins pitcher Alex Sanabia claims he didn't know spitballs were illegal
Explaining the notorious and mysterious spitball
Spitball Baseball Cap – Cooperstown All Star Village
Baseball- The Spitball 1967 Sports Illustrated 7/31/67 NO LABEL 144599 | eBay
Alex Sanabia brings back the spitball in beating the Phillies - NBC Sports
Spitball Outlawed but 17 pitchers were "Grandfathered" in - History of Cardinals
End of the Spitball Era | Sports History Weekly
The Demise of the Spitball is Greatly Exaggerated | by Douglas Pilarski | ILLUMINATION | Medium
Gaylord Perry Spitball Feature with Bob Uecker - 1984 - YouTube
Spitball! Alex Sanabia of Miami Marlins slobbers on ball, in plain view, after Domonic Brown homer
Gaylord Perry: Spitballs totally different from PED use - CBSSports.com
Dreyfuss led spitballer ban | Baseball Hall of Fame
The Spitball – The Baseball Umpire
Alex Sanabia Might Be In Trouble For Spitballing | FanGraphs Baseball
Burleigh Grimes – Society for American Baseball Research
Henry Mason's baseball journey: Kansas City Monarchs to Major Leagues
Ed Walsh's Spitball | Warehouse 13 Artifact Database Wiki | Fandom
Dreyfuss led spitballer ban | Baseball Hall of Fame
