Cards average EX-NM in my opinion.
MARK MCGWIRE (9) Card Rookie Lot - Oakland A's
The Big 5 — A Rundown of Major Mark McGwire Rookie Cards – Wax Pack Gods
mark mcgwire rookie Values - MAVIN
Auction Item 252957968923 Baseball Cards 1987 Donruss
At Auction: Oakland Athletics Mark McGwire Signed Photograph
1991 Donruss Highlights Oakland A's Mark McGwire BC-9 on eBid United States
1988 Classic Blue #MMDM Mark McGwire w/Don Mattingly Rookie Card - Mint Condition Ships in New Holder : Collectibles & Fine Art
Mark McGwire Stats & Facts - This Day In Baseball
MARK MCGWIRE (9) Card Rookie Lot - Oakland A's
Throwback Thursday: Remembering Mark McGwire's 1987 Rookie Season - Athletics Nation
Popularity of 1987 Topps Baseball set leads to interesting TTM project - Sports Collectors Digest
Auction Prices Realized Baseball Cards 1987 Topps Tiffany Mark McGwire
Sold at Auction: Mark McGwire PSA 9 Topps 1987 Rookie Baseball Card