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BaseballMusings, via James Crabtree, points out that the 1905 Reach Guide is available for free download via Google Books.

However, if you take that one step further and search Google Books for other baseball books, you'll see that the 1905 Reach Guide isn't the only one available. This search will return all books that Google Books has the full text freely available, many of which can be downloaded directly. Included are Baseball Goes to War, by William B. Mead, the 1910 Baseball Reach Guide, and the 1912 Who's Who in Baseball.

And don't forget that the full run of Baseball Digest is also available on Google Books.