Canal Commission authorization--1969 : hearing before the Committee on Merchant Marine and Fisheries, House of Representatives, Ninetieth Congress, second session on H.R. 15190, a bill to amend sections 3 and 4 of the act approved September 22, 1964 (78 Stat. 990), providing for an investigation and study to determine a site for the construction of a sea-level canal connecting the Atlantic and Pacific Oceans, March 7, 1968