Big Blue 1840-1940: Stamps of Argentina 1899-1939,Cherrystone Auctions Sale - 520A Page 5,Robert A. Siegel Auction Galleries, Inc. Sale - 1130 Page 108,1654 - 1976 13c State Flags: Alabama - Mystic Stamp Company,Robert A. Siegel Auction Galleries, Inc. Sale - 1075 Page 35