The detailed manual used by U.S. astronauts Neil Armstrong and Buzz Aldrin to land on the moon in 1969 is going up for auction in July and could fetch up to $9 million, New York auctioneers Christie's said on Wednesday.

The 44-page ring-bound Apollo 11 lunar module timeline book details every procedure that was needed to undock, land and rendezvous the Eagle with its Columbia command module when Armstrong and Aldrin became the first men to walk on the moon.

"These are step-by-step instructions that cover the entire portion of the Eagle flight. It is a series of instructions on everything from 'don your helmets' to 'check your power system,' " Christina Geiger, head of books and manuscripts at Christie's, told Reuters.