It was being sold in RR as a complete book, and I thought the one offered here was pages removed from the book. I really thought they were two different items.
Here's the auction link:
http://www.rrauction.com/bidtracker_detail.cfm?IN=850
Maybe none of the pages sold and he inserted them back into the book? If so, this description isn't accurate:
Signed book: Who’s Who in Major League Baseball. First edition. Chicago: Buxton Publishing Co., 1933. Hardcover, 9 x 11.25, 544 pages. Signed on the portrait on his biographical page in fountain pen, “Walter Johnson.”
Also signed on several other pages by fellow players. Interior book pages in fine, clean condition but for collector’s pencil notations throughout updating the ballplayers’ career details, and slight skipping to ink in Johnson’s signature; book in very good condition, with a cracked and loose spine, and dings to edges and corners of the covers. This was the first edition of the Who’s Who ever published and is considered one of the more important baseball books of its era; other versions, released in digest form, would be issued annually until 1955. In addition to the historical importance of the book, signed images of Johnson are scarce and highly sought after. Pre-certified Steve Grad/PSA/DNA and RR Auction COA.