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1.

Age of Information: An Interdisciplinary Survey of Cybernetics

Age of Information: An Interdisciplinary Survey of Cybernetics by T. C. Helvey ISBN: 9780877780083 List Price: $34.95

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2.

Space Trajectories

Space Trajectories by Helvey, T. C. ISBN: 9780123404503 List Price: $53.00

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3.

Moon Base - Technical and Psychological Aspects

Moon Base - Technical and Psychological Aspects by Helvey, T. C. ISBN: 9780598720948 List Price: $30.00

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