Martin Marietta Corp., Denver Division, April, 1977. The Viking Lander to mission to Mars performance report appears to be an interal publication with the number of copies produced unknown. 8 1/2" x 11". First page has three printed signoffs by authors and key members of the Viking team, C.G. Cooley and J.G. Lewis. Aso, approved and signed by NASA Viking Project Manager, G.C. Broome. Small nick along top edge o/w Fine condition. Rare.