"Type Two Double Eagles 1866-1876, Second Edition", by Douglas Winter and Michael Fuljenz, 1999. This copy courtesy of the American Numismatic Association library.
Full title: "Type I Double Eagles, 1850-1866: An Insider's Guide to Collecting", by Douglas Winter an Adam Crum, 2002. Special contributions by Bob Evans. This copy courtesy of the American Numismatic Association library.
