Two identical books, one of which is signed: Skylab Explores the Earth. Washington, DC: NASA, 1977. Hardcover, 9.5 x 11.5, 517 pages. One is signed on the title page in black and blue felt tip by three Skylab astronauts, “Skylab I Photos, Charles Conrad, Jr., CDR,” “Skylab II Photos, Alan Bean, CDR and Crew,” and “Skylab III photos by Jerry Carr & crew, plus 4 EVAs! Nov 1973 to Feb 1974.” In overall very good condition, with a significant vertical crack to the center of the signed book’s front cover. An experienced professional book binder could replace the signed book’s cover with the undamaged cover of the unsigned book. Pre-certified Zarelli Space Authentication.
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