Additional Interoceanic Canal Facilities: Hearing[s] Before the Committee on Interoceanic Canals, United States Senate, Seventy-sixth Congress, First Session, on S. 127, a Bill Authorizing Negotiations and Providing for the Construction, Maintenance, and Operation of an Interoceanic Canal Over Nicaraguan Territory, and for Other Purposes; and S. 2229, a Bill Authorizing and Providing for the Construction of Additional Facilities on the Canal Zone for the Purposes of More Adequately Providing for the Defense of the Panama Canal and for Increasing Its Capacity for the Future Needs of Interoceanic Shipping, Volumes 1-2