I just got a new book!
I'm a long-time supporter of Baseball-Reference and this was a gift sent to all of us by founder Sean Forman. B-R now includes Negro League stats and treats them as equivalent to MLB stats. Oscar Charleston, for example, is now listed among the all-time leaders in slugging percentage, just a tick above Jimmie Foxx and Barry Bonds!
I'll let you know my thoughts when I finish reading.
--M.C.
p.s. You can get the book in paper on Amazon or an e-book at the SABR website.