Merchant marine legislation : hearings before the subcommittee of the Committee on Interstate and Foreign Commerce, United States Senate, Eighty-fifth Congress, second session on S. 3919, to amend section 1105 (b) of title XI (federal ship mortgage insurance) of the Merchant Marine Act, 1936, as amended, to implement the pledge of faith clause : S. 2568, to amend the Merchant Marine Act, 1936, as amended, to promote and encourage the construction, and to expedite the financing from private sources of vessels suitable for use in the foreign and domestic trade of the United States, and for defense purposes, and to encourage the maintenance of shipyards, and to preserve the supply of skilled shipyard workers : S. 3361, to promote the national merchant marine policy by providing for the construction of 30 merchant vessels : S. 3499, to amend the vessel admeasurement laws relating to water ballast spaces and S. 3106, to amend section 716 of the Merchant Marine Act, 1936, as amended, to provide indemnity protection in respect of the nuclear-powered merchant ship, February 26, June 17 and 18, 1958.