http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Series of annual reports presenting detailed observations of Naval Observatory, and descriptions of astronomical instruments and methods. Beginning in 1861, reports also include data on D.C. barometric pressure, wind, temperature, and precipitation. From 1861 through 1875, reports also include a listing of publications presented to Observatory library.
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2014. digital, PDF file. ProQuest U.S. Executive Branch Documents Mode of access: World Wide Web via ProQuest website.