Zoning regulations of the District of Columbia : adopted by the Zoning Commission under and by virtue of the authority conferred upon it by an act of congress approved june 20, 1938, as amended, effective may 12, 1958

Zoning regulations of the District of Columbia : adopted by the Zoning Commission under and by virtue of the authority conferred upon it by an act of congress approved june 20, 1938, as amended, effective may 12, 1958