. . . . . "The Naval Observatory : its history, activities and organization" . "The Naval Observatory : its history, activities and organization"@en . . "The Naval Observatory; its history, activities and organization" . "The Naval Observatory : Its history, activities and organization" . . . . . . . . . . . "The Naval Observatory, its history, activities, and organization" . . . . "The Naval Observatory its history, activities and organization"@en . "The Naval Observatory" . . "The naval Observatory" . . "United States Naval Observatory." . . "Brookings Institution." . .