File:Multiple planet flyby missions to Venus and Mars in 1975 to 1980 time period.pdf
Multiple_planet_flyby_missions_to_Venus_and_Mars_in_1975_to_1980_time_period.pdf (file size: 2.75 MB, MIME type: application/pdf)
Powered and free-return Venus-Mars flyby trajectories from 1975 - 1980
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