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Dave Grimes.....and additionally there is significant information over the 5 volumes that pertains to Baseball. Before the advent of the specialist Baseball catalogs appearing in the 80s(?) the WTI provided the only significant listings of vintage baseball cards like the Old Judge series.
Much of the information has now been superceed with additional cards in checklists, compendiums of back variations etc, but for a TRUE collector the series is a MUST addition to their library.