Latest Friedberg is 20th edition, if not on eBay or Amazon or others, check this: http://www.coin-currency.com/page8.html I also use the Standard Catalog of United States Paper Money from Krause, I got on the CD for my laptop when I go to a show. Check it out here: http://www.krausebooks.com/standard-catalog-of-united-states-paper-money-cd Hope this helps.
