In addition to the aforementioned Disneyland: The Nickel Tour and Disneyland: Inside Story, you should also check out Designing Disney (a Walt Disney Imagineering book), Disneyland: The First Quarter Century (surprisingly well put together for a 'souvenir' book) and Disneyland Resort: Memories of a Lifetime (features some of the best photos out of all of the books listed). Best of all, the last three listed are still available for under $10 each!

Hope this helps! :)