More about the routes and paths, propitious times, required velocity, and types of rockets and piggyback vehicles proposed...
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MANNED SPACECRAFT TO MARS AND VENUS: How They Work
by ‧RELEASE DATE: Feb. 12, 1975
More about the routes and paths, propitious times, required velocity, and types of rockets and piggyback vehicles proposed for future (indefinite) manned orbits and on-site explorations of Mars, flybys of Venus and maybe a stopover at Mercury. As for the astronauts, perhaps learning the secret of hibernation will help prevent boredom on the long trip, while medical teams and earth observers will be on guard against Martian germs and solar flares. Relatively straight specs for those who still care how it might work.