Posted By:
Chuck RossThe best guides to non-sports gum cards (fairly good info but far out of date on prices) are the Sport Americana Guides to Non-Sports Cards by Chris Benjamin. They show up on eBay fairly often, but since they are all out of print they have become collectible and sometimes a little expensive themselves. For non-sports tobacco cards (T and N) the best guide in my opinion is American Tobacco Cards by Robert Forbes and Terence Mitchell. You can get it from amazon.com.
Chuck R