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41
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43
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44
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45by Eberhart, George M.Table of Contents: “...v. 1. Unidentified flying objects -- v. 2. The extraterrestrial contact movement....”
Published 1986
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46Published 1990“...Search for extraterrestrial intelligence....”
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47by Friedman, RobertSubjects: “...Extraterrestrial environments. nasat...”
Published 1998
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48
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60Published 1986Government Document Book