Northern Virginia Regional Planning and Economic Development Commission & National Capital Open Space Program. (1965). Action for open space. s.n.
Citace podle Chicago (17th ed.)Northern Virginia Regional Planning and Economic Development Commission a National Capital Open Space Program. Action for Open Space. Arlington, Va: s.n, 1965.
Citace podle MLA (9th ed.)Northern Virginia Regional Planning and Economic Development Commission a National Capital Open Space Program. Action for Open Space. s.n, 1965.
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