Spink Numismatic Circular
More editions
IAPN/IBSCC Bulletin on Counterfeits, Vol. 4, No. 4, Winter 1979, p. 99. 4 "ANS
Council Issues Policy Statement", American Xumismatic Society Newsletter,
Winter 1984, p. 5. 5 "Design Variations in the Mexican 'Pillars' Issues". Frank
Gilboy.