Gaithersburg Latitude Observatory
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The Gaithersburg Latitude Observatory, located in Gaithersburg, Maryland is one of the system of six International Latitude Observatories, and (as of 2004) the only National Historic Landmark in the City of Gaithersburg. See the entry (http://tps.cr.nps.gov/nhl/detail.cfm?ResourceId=1894&ResourceType=District) in the register of National Historic Landmarks and this page (http://www.cr.nps.gov/history/online_books/butowsky5/astro4i.htm) in the National Park Service's Links to the Past (http://www.cr.nps.gov/) website.