Amending Merchant marine act. 1936, as amended, henrings before subcommittee on maritime affairs, 81st Congiess. 1st session, on H. R. 3289, H. R. 3337, H. R. 3930. H. R. 4190, H. R. 4847, H. R. 5340, May 31-July 7, 1949.