Just wondering if anybody could recommend a good book or two on petroliana collecting? I was at Barnes & Noble the other day and the only book they had was the "Encyclopedia of Petroliana." Lots of nice pictures but no real info such as spotting fakes, dating items, etc. Are there any good books out there or is it all online? Thanks.

p.s. I know there is a book on collecting Sohio. Anybody know how good/informative it is?