"Washington (D.C.)" . . . . "Boundary markers of the Nation's Capital a proposal for their preservation & protection : a National Capital Planning Commission Bicentennial report"@en . . . . "Boundary markers of the Nation's Capital : a proposal for their preservation & protection : a National Capital Planning Commission Bicentennial report" . . "History"@en . . . . "History" . . . . "Boundary markers of the nation's capital : a proposal for their preservation and protection"@en . . "Boundary markers of the nation's capital a proposal for their preservation and protection"@en . . . . . .