Regulating the Erection of Structures on the Potomac River Adjacent to the Proposed George Washington Memorial Parkway in the District of Columbia: Hearings Before the Committee on the District of Columbia, House of Representatives, Seventy-first Congress, Second Session on S.J. Res. 159 [182] and H.J. Res. 345, Companion House Bill, a Joint Resolution Prohibiting Location Or Erection of Any Wharf Or Dock Or Artificial Fill Or Bulkhead Or Other Structure on the Shores Or in the Waters of the Potomac River Within the District of Columbia Without the Approval of the Commissioners of the District of Columbia and the Director of Public Buildings and Public Parks of the National Capital. June 18 and 20, 1930