Inquiry Into the Operations of the Maritime Commission with Particular Reference to Allowances for National-defense Features and Construction-differential Subsidies Under Title V of the Merchant Marine Act of 1936, as Amended: Hearings Before a Subcommittee of the Committee on Expenditures in the Executive Departments, House of Representatives, Eighty-first Congress, First Session. July 21, August 8-9, 15-17, and September 8, 1949