U. S. Naval Observatory: The Move to Georgetown Heights and Double Star Work (1850–1950) Brian Mason (Autore) PDF (English) Identificativi (Articolo) DOI: https://doi.org/10.11588/monstites.2009.1.19928 Identificativi (File) URN: http://nbn-resolving.de/urn:nbn:de:bsz:16-monstites-199288 (PDF (English)) Statistiche Fascicolo V. 18 (2009): Monuments and Sites Sezione Artikel Lingua en Licenza