Sure, this is the money we spend today, but since 1928 there have been numerous emissions with signature changes, minor and major design changes, different forms of backing (silver certificates, gold notes, etc.) plus other varieties that make collecting small type a continuous challenge where there still are many treasures to be discovered.
Please note: Denly's can not accept credit card payment for any orders on $500 or $1000 Small Size Notes.
This reference (just released Oct. 2011), designed for the specialist and dealer, offers the most complete data to be found anywhere for small-size currency, organized and listed by specific series, including accurate population figures for each. The book also contains detailed tutorial information. Most up-to-date census for all U.S. small-size currency.