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X2000 Systems and Technologies for Missions to the Outer Planets
STUDIES WITH MICROORGANISMS AND PLANTS UNDER SIMULATED MARTIAN ENVIRONMENTS
Nasa to begin unmanned mars exploration this year /a fact sheet/ news release no. 64-205
Mars round trip mission analysis for the unfavorable 1975-1985 time period
Mars round-trip mission analysis for the 1975- 1985 time period.