Demonstration cities, housing and urban development, and urban mass transit : hearings before the Subcommittee on Housing of the Committee on Banking and Currency, House of Representatives, Eighty-ninth Congress, second session on H.R. 12341, a bill to assist city demonstration programs for rebuilding slum and blighted areas and for providing the public facilities and services necessary to improve the general welfare of the people who live in these areas : H.R. 12946, a bill to provide incentives to planned metropolitan development and to otherwise assist urban development : H.R. 13064, a bill to amend and extend laws relating to housing and urban development : H.R. 9256, a bill to amend the National Housing Act to provide mortgage insurance, and authorize direct loans by the Housing and home Finance Administrator, to help finance the cost of constructing and equipping facilities for the group practice of medicine or dentistry (and related bills).