I wouldn't consider it particularly useful as a research tool, but as a straight cataloging resource, I've been working on adding as many minor league sets as I can into the Inventory Manager over at SportsCardForum.com (mostly modern, post-1950 sets). I've loaded everything from Beckett, the Standard Catalog, and from any other resources I've been able to track down for sets that both of those books missed, or just sets since 2007 since Beckett basically stopped listing new minor league sets years ago. Unfortunately, the Standard Catalog stopped listing the actual cards from the minor league team sets sometime after releasing their last Standard Catalog of Minor League Baseball Cards back in 2000. Since then, at least for modern sets, they only list the set and maybe mention a few key players. They're much more comprehensive for the older sets.
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