Von Braun
Wernher Von Braun Mars Studies with Boeing
In 1947 and 1948, to relieve boredom, von Braun wrote a novel about an expedition to Mars.
First studies
1952 (some from 1948)
1956
1969 concept
By 1969 he had a design that was entirely reusable for future expeditions for 12 crew, In that design is interesting is the time scale he also gave. "Testing in earth orbit of the first Mars Excursion Module would begin in 1978, with the first Mars landing coming in 1982." 4 years, "further expeditions to Mars in 1983, 1986, and 1988 - leading to a 50-person Mars base by 1989." Elon Musk time scale!
1969 concept
Enroute
EDL
mars excursion module