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Max WederAndy McCue's baseball bibliography Baseball by the Books is an essential buy in this area. The book covers up to 1992 or so. Andy has been one of the main forces behind http://www.baseballindex.org which is a project to list all baseball publications. A search can be done for baseball fiction.
Bobby Plapinger of Ashland Oregon has been selling baseball books full time since 1989 or so, and publishes a catalogue of many titles.
One of the interesting baseball fiction books is The Speed Boy, published in 1938
The author fictionalizes a number of T-era stars, and writes about the game circa 1910 at a time when the stolen base was disappearing as an offensive weapon.
I'd list a number of others (there are numerous small press titles from the 1980's onwards that cover vintage baseball), but I'm travelling in Australia, and I am too preoccupied with burning questions such as straight arm bowling and the 15% degree allowance, whether to walk off, and of course trying to figure out what a googly is, and does Jamey Moyer throw it.
All out,
Max