Haxby: Obsolete Banknotes, Complete 4-Volume Set
Standard Catalog of United States Obsolete Bank Notes 1782-1866 by James A. Haxby. Complete four-volume set in excellent used condition with tight binding and no writings or marks.
Out of print for 35 years and much in demand. Published by Krause Publications, Inc. in 1988 and still the most comprehensive reference on obsoletes.