I’ve been trying to get my hands on a copy of the NYC Transit Authority Graphics Standards Manual for years now with no luck. I came very close last year when I was bidding on an eBay auction for a copy, but I lost it. I still regret not bidding higher.
Seems like these folks have better luck, because they happened to find a first edition copy in a locker beneath some old gym clothes at Pentagram’s NY office. Are you kidding me? Nope. Lucky bastards. They photographed every page and put high-res photos up on a site for us all to drool over. Enjoy.