Very desirable set of four official NASA softcover books relating to the Mercury Program’s first four orbital spaceflights, each signed on the front cover by the mission’s respective pilot, with titles as follows: Results of the First United States Manned Orbital Space Flight, signed and inscribed in black felt tip, “To David—John Glenn”; Results of the Second United States Manned Orbital Space Flight, signed in black ink, “Scott Carpenter”; Results of the Third United States Manned Orbital Space Flight, signed in blue ink, “Wally Schirra” who adds a Sigma 7 symbol; and Results of the Fourth United States Manned Orbital Space Flight, signed in silver ink by Gordon Cooper. In overall fine condition, with light sunning to the spines. A scarce and sought-after set featuring autographs by the final four pilots of the historic Mercury Program.

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