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4Published 1997Subjects: “...Astronomical observatories....”
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7by Kirby-Smith, H. T. (Henry Tompkins), 1938-Subjects: “...Astronomical observatories United States Directories....”
Published 1976
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10Published 1992Government Document Microform Book
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11Published 1995Subjects: “...Astronomical observatories Automation....”
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19Published 1813Subjects: “...United States Naval Observatory....”
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20Published 1815Subjects: “...United States Naval Observatory....”
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eBook