U.S. Naval Observatory [1809-1948] : first draft narrative prepared under the general supervision of the Director of Naval History / prepared by J.F. Hellweg ; foreword by Guy W. Clark. [1948]

Hellweg, J. F. (Julius Frederick), b. 1879.

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United States. Naval Observatory

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Organizational History 1830 Establishment of the Depot of Charts and Instruments, Washington, D.C. 1843 1844 Construction of the observatory on its present site 1846 Publication of the first ...