Communication from the President of the U.S. Relative to Tax Deferment and Tax Exemption Benefits to the Maritime Industry, Together with a Report to the President on Government Assistance Necessary to Maintain a Merchant Marine Adequate to the Commercial and National Defense Requirements of the U.S. Submitted by the Secretary of Commerce, and a Supplementary Report Submitted by the Treasury Department Entitled "Scope and Effect of Tax Benefits Provided the Maritime Industry".