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1BookPublished 1974“…United States Naval Observatory. Nautical Almanac Office…”
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2Government Document SerialPublished 1958“…United States Naval Observatory. Nautical Almanac Office…”
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3SerialPublished 1960“…United States Naval Observatory. Nautical Almanac Office…”
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4Government Document SerialPublished 1980“…United States Naval Observatory. Nautical Almanac Office…”
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