Have you tried the Encyclopedia of US Paper Money? I do not know if that is the full name of the book, but that hardcover guide is incredible...
Edited by mintcollector (07/22/12 08:45 PM)
Question: "I was wondering how you deal with collectors and speculators who truly believe that the items they are buying now are going to be worth a lot of money in the future...?"
ANSWER: "The safest approach is to avoid discussing the topic of future collectability with these individuals: first, they know more than anyone else; second, they are deaf to any opinion that does not agree with their own; third, they are misguided optimists, assuming past practice could not possibly apply in their case."
-Harry Rinker; 'The Myth of the Guaranteed Collectible'
(originally posted on WorthPoint and Harry Rinker's own website)