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Buildings and structures in Gaithersburg, Maryland
Historic districts on the National Register of Historic Places in Maryland
National Historic Landmarks in Maryland
Historic American Engineering Record in Maryland
National Register of Historic Places in Montgomery County, Maryland
Government buildings on the National Register of Historic Places in Maryland
1899 establishments in Maryland
Astronomical observatories in Maryland
Government buildings completed in 1899

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Gaithersburg Latitude Observatory

International Latitude Service

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Gaithersburg, Maryland

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