Second '92-D Close AM die pair found - Numismatic News
Close AM / Wide AM
1 Million Pennies Project: WAMs and CAMs
Dimes, US, North & Central America, Coins, Coins - PicClick AU
Second '92-D Close AM die pair found - Numismatic News
Highlights Hannigan's Rare Coins / U.S. Currency LLC
Coin Grading and Authentication Services
Stacks Bowers Galleries May 2016 Rarities Auction
PCGS Variety Attribution
1988 doubled ear/wide am Lincoln cent
Newman Numismatic Portal at Washington University in St. Louis
1787 Connecticut Copper. Miller 33.13-Z.7, W-3560. Rarity-5