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Truncated references
SEP 01, 1980
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Silencing dissidence in the US
SEP 01, 1980
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More on amateurs
SEP 01, 1980
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Corrections
SEP 01, 1980
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Stretching longevity
SEP 01, 1980
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Brezhnev’s title
SEP 01, 1980
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Subtle review
SEP 01, 1980
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Sagan versus Velikovsky
SEP 01, 1980
Letters
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Observers observing observables
SEP 01, 1980
Letters
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Detectives of art forgery
SEP 01, 1980
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More on Esperanto
SEP 01, 1980
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Satellite power system
SEP 01, 1980
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