I believe it is the Friedberg guide, Paper Money of the United States, now in it's 20th or 21st edition. Here's the description from Amazon: "Now with every illustration in color. This landmark work is the standard reference on American currency since 1953, acknowledged as the most comprehensive and universally recognized guide on the subject, illustrating and valuating all types of United States paper money. From the first year of Federal paper money, 1861, to date, both sides of all currency, from 3 cents to $100,000 are illustrated and accompanied by text listing, describing and pricing, in up to seven conditions, every variety of paper money ever issued. The result is a complete pictorial, descriptive and numismatic history of United States currency. Also with sections on Colonial and Continental currency and the Confederate States of America, and chapters on error notes, encased postage stamps and postage envelopes. For those who think of America's currency as a constant study in green and black, the rainbow-like diversity shown by the more than 800 color illustrations is a revelation in itself. New information has been added and valuations updated, making it possible to establish the value of any note. Paper Money of the United States has been an invaluable asset to currency collectors and numismatists. It also possesses an appeal and value to lovers of Americana, of the fine art of engraving, and students of American history, finance and economics. Banks will find this book especially useful in that it makes possible the immediate identification and valuation of all obsolete but still legal tender currency. It is a book which belongs in every library, public and private." Jesse
FWIW, I would recommend the Standard Catalog over the Whitman. Both cite retail prices, much like the 'Red Book', but I find the pricing more accurate in the Catalog. More pictures and information, to boot.
