39 U.S.C. § 5601
Sea post service
The Postal Service may maintain sea post service on ocean vessels conveying mail to and from the United States.
( Pub. L. 91–375 , Aug. 12, 1970 , 84 Stat. 773 .)
The Postal Service may maintain sea post service on ocean vessels conveying mail to and from the United States.
( Pub. L. 91–375 , Aug. 12, 1970 , 84 Stat. 773 .)