New York Yankees Baseball Card Team Sets
C.A.: 2022 Topps MLB Rookie of the Year 75th Anniversary Frank Howard
SABR's Baseball Cards Research Committee – Page 28
2006 Topps # 420 Gary Sheffield New York Yankees (Baseball Card) NM/MT Yankees : Collectibles & Fine Art
Night owl's all-time Topps set countdown all in one place finally
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Pinnacle and Score – SABR's Baseball Cards Research Committee
Pinnacle and Score – SABR's Baseball Cards Research Committee
Gary Sheffield Memorabilia, Autographed Gary Sheffield Collectibles
C.A.: 2022 Topps MLB Rookie of the Year 75th Anniversary Frank Howard
2021 New York Yankees Media Guide, PDF, Major League Baseball
Turn back the clock, Topps
Gary Sheffield Memorabilia, Autographed Gary Sheffield Collectibles