Hearings Before the Committee on Commerce, United States Senate, Eighty-eighth Congress, Second Session, on S. 2428, a Bill to Authorize a Study of Means of Increasing the Capacity and Security of the Panama Canal, and for Other Purposes; and S. 2497, a Bill to Provide for an Investigation and Study to Determine a Site for the Construction of a Sea Level Interoceanic Canal Through the American Isthmus. March 3 and 4, 1964