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Results of the spectroscopic and photographic observations made at the Royal Observatory, Greenwich, in the year ...

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Item Link Original Source
Full view   1888 Princeton University
Full view   1889 Princeton University
Full view   1890 Princeton University
Full view   1893 Princeton University
Full view   1894 Princeton University
Full view   1895 Princeton University
Full view   1896 Princeton University
Full view   1897 Princeton University
Full view   1898 Princeton University
Full view   1899 Princeton University
Full view   1900 Princeton University