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Posted By: Anthony

I'd add in Lipset's Encyclopedia of Baseball Cards, available from Old Cardboard or directly from the author.
All the back issues (less #7) of VCBC are helpful, and certainly a subscription to Old Cardboard.
Getting on Mastro's and REA's mailing list helps too, the catalogs (as well as those of the other auction houses) are full of information and give you a good idea of how often certain issues come up, and at what price.