It's true that the Fiddler on The Roof and No No Nanette books are great, but I haven't seen them for sale in years. I would snap them up if I ever saw them at the Strand. There's a similar book about Jesus Christ Superstar, that goes through the history of the original album and stage productions, with a lot of interesting info about Tom O'Horgan. And if no one else has mentioned it, "The Making Of Big" is also excellent.
Behind the fake tinsel of Broadway is real tinsel.