SP-4212
On Mars: Exploration of the Red Planet. 1958-1978

The graphs illustrate the major milestones for the Viking lander and orbiter and the amount of money required for each phase of the project.

The graphs illustrate the major milestones for the Viking lander and orbiter and the amount of money required for each phase of the project. From Langley Research Center, Viking Proj. Off., "Viking 75 Project, Resource Planning Report, July 1970,''30 July 1970. PDR = preliminary design review. CDR = critical design review. PTO = proof-test orbiter.

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