"History's Jackpot: Investing in Antique Collectibles" by Craig Gottlieb

"As an investment, antique posters are an underratted genre.  Ask Jim Lapides what he thinks about investing in vintage posters, and he'll tell you the timing couldn't be better... Prices are so reasonable that for very little money, a poster collector can own a significant piece of art history.  Try spending just a few thousand dollars for the top art in another art genre!"