Bibliografía (11 obras)
U. S. Coins and Currency, Warman's Companion
2009
Us Coins Currency
Warman's U. S. Coins and Currency Field Guide
2008
Warmans Coins and Paper Money Warmans Coins Paper Money
Warman's U.S. coins & currency field guide
2006
World coins & currency
U.S. coins & currency
Warman's coins & paper money
1999
Warman's coins & currency
1995
Papal Coins
1991
Papal Numismatic History
