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1Published 1994Subjects: “...Planets Exploration....”
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2Published 1988“...Alpha Centauri Discovery and exploration....”
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3Published 1988“...Outer space Exploration....”
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4Published 1988“...Outer space Exploration....”
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5Published 1987“...Outer space Exploration....”
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9Published 1993“...Outer space Exploration....”
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10by Brandhorst, Henry W.“...Outer space Exploration....”
Published 1990
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11by Montoya, Earl J.“...Outer space Exploration....”
Published 1987
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12by Bents, David J.“...Outer space Exploration Planning....”
Published 1990
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13Published 1985“...Outer space Exploration Research....”
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14Published 1993“...Outer space Exploration United States....”
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15Published 1997“...Outer space Exploration United States....”
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16Published 1988“...Outer space Exploration Venus (Planet)...”
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18Published 1992“...Outer space Exploration United States....”
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19Published 1993“...Outer space Exploration United States....”
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20Published 1995“...Outer space Exploration United States....”
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