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. 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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