Upon returning to earth, the crew of Apollo 11, the first lunar landing mission spent many months touring the world as heroes. Neil Armstrong, Buzz Aldrin, and Michael Collins became three of the most famous people on earth.
Nixon, who had a reputation of being distrustful of the press, used the Apollo 11 success as a chance to send a souvenir packet to journalists, perhaps to win their favor.
This package includes an envelope, letter from Nixon, and first day of issue stamp folio. The crew signatures are printed and the Nixon signature is (I think) an autopen.