46 CFR §67.132

1. (a)Vessels not otherwise entitled to be operated in the coastwise trade or in the fisheries may obtain these privileges as a result of special legislation by the Congress of the United States.
2. (b)In addition to any other submissions required by this part, the owner of a vessel which is entitled to engage in a specified trade because it is the subject of special legislation must include a copy of the legislation to establish the entitlement.