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Pioneer Venus project - Wikipedia
Pioneer Venus 1 - NASA Science
Pioneer Venus Orbiter - Wikipedia
40 Years Ago: Pioneer Orbiter Begins Most Comprehensive Study of Venus …
40 Years Ago, Pioneers Encounter Venus - NASA
Pioneer Venus Project Information - NSSDCA
Pioneer Venus 2 - NASA Science
NASA - NSSDCA - Spacecraft - Details
40 Years Ago, Pioneer Venus Orbiter Launched on Quest to Study ... - NASA
Pioneer Venus - Laboratory for Atmospheric and Space Physics