Variations
I only collect Topps and Fleer baseball, and the principal sources I have used are the SCD big book and a publication by a guy named Gilkeson, that was updated through 1995. The latter covers basketball, football and baseball and has a lot of stuff not covered in the traditional catalogs ( but a lot of the listings are printing defects and errors, as well as variations).
With all the selling and scans on the internet/ebay today, there has been an explosion in listed errors, variations and print defects. But the most sought after ones are the ones that make it into the master set lists on the registry or in one of the major catalogs. I like the SCD Standard Catalog Of Baseball Cards, myself.
Doug Goodman on this board ( posted in this this thread) has a lot of expertise in this area.
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