NASA NTRS · 19670048098
An evolutionary program for manned interplanetary exploration.
Abstract
Evolutionary manned interplanetary exploration program with modular elements used for flyby, orbital capture and Mars landing, noting influence of Apollo program
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Bell, M. W. J.. 1967-05-01. An evolutionary program for manned interplanetary exploration.. https://ntrs.nasa.gov/citations/19670048098
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