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Case for Mars Conference 1987 (University of Colorado)

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Case for Mars III: Strategies for Exploration--Technology (Science and Technology Series)
Case for Mars Iv: Considerations for Sending Humans: The International Exploration of Mars--Consideration for Sending Humans: Proceedings of the Fourth ... 1990, at (Science and Technology Series)
Case for Mars III: Strategies for Exploration Technical (Science & Technology Series)