The 44-page instruction manual used by Neil Armstrong and Buzz Aldrin during the moon landing expedition in 1969 will be sold in an auction this year, celebrating the 50th anniversary of Apollo 11.

The manual serves as an integral piece of space history that gives insight into the complex journey to the moon.

Christie’s estimates that the anonymous consigner will get anything from seven to nine million dollars for this extremely valuable manual.

The manual contains mission details such as step-by-step instructions, handwritten landing coordinates, sky reports and time stamps of completed tasks.

Christina Geiger, head of books and manuscripts at Christie’s America stated:

“The portion of time the book covers is from the beginning of entering the lunar module, undocking from the command module Columbia, [until] they begin the power descent initiation.”

The Apollo 11 Lunar Module Timeline Book will be available for public viewing in New York starting May 3 through May 17, 2019. It will be circulated around the world before being sent back to New York for its auction on July 18th. It will be sold by a private collector who previously purchased the artefact from Aldrin.