Sailors. Manning requirements on certain vessels, hearings, 77th Congress, 1st session, on H. R. 554, to exempt sail vessels from provisions of sec. 13 of act of Mar. 4, 1915, as amended, requiring manning of certain merchant vessels by able seamen, and H. R. 2520, to amend act to except yachts, tugs, towboats, and unrigged vessels from certain provisions of act of June 25, 1936, as amended, Feb. 20, 1941.