I don't know about monthly but OldCardboard magazine and the yearly Krause SCD would be the first 2 on my list. Beckett does a Graded Card Price Guide, in print, that is really good and on target for vintage. They have modern in it too and I have heard mixed reviews on that pricing....but I know from personally looking through it that the vintage pricing is as good as it gets.
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Leon Luckey
www.luckeycards.com
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