Ariane 5 Manual

The Arianespace Ariane 5 is one of the largest space boosters around. 151 to 170 feet (46-52m) tall, weighs 780 tons at liftoff. Capable of lifting 10 metric tons to geostationary orbit, or 20 metric tons to low earth orbit.

I now have the user's manual.

It's 238 pages, and you can get it for free in pdf form here.

I think it's the largest thing in the world with a user's manual. There's not a lot of, ya know, skyscrapers and aircraft carriers that come with a single manual. I may, in fact, have to print this out someday.