"The T206 Collection: The Players and Their Stories"
"Collecting Sports Legends: The Ultimate Hobby Guide" by Joe Orlando (of PSA)
The Old Judge book that another poster mentioned is "The Photographic Baseball Cards of Goodwin & Company (1886-1890)" by Jay Miller, Joe Gonsowski and Richard Masson (the first two of whom are members of this board)
You mentioned having the 1999 Standard Catalog, but you might want to get the most recent edition (5th, 2015) of the Standard Catalog of Vintage Baseball Cards. It only covers cards from before 1981, and it includes a lot of stuff that was not known or catalogued in 1999.
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