To eliminate Pacific coast shipbuilding cost differential : hearings, Eighty-seventh Congress, first session, on H.R. 1159, to amend Merchant Marine Act, 1936, in order to eliminate the 6 per centum differential applying to certain bids of Pacific coast shipbuilders; H.R. 213, to repeal section 502(D and a portion of section 509 of the Merchant Marine Act, 1936, which requires bids by Pacific Coast Shipbuilders re approved under certain circumstances; H.R. 2291, to amend sections 502(D) and 509 of the Merchant Marine Act, 1936, relating to approval of certain bids by Pacific Coast Shipbuilders, May 15, 16, 17, 18, 19, 23, and 24, 1961.