Marina mercantile degli Stati Uniti d'America: differenze tra le versioni

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*{{cita web |1=http://www.marad.dot.gov/Publications/Compilation%2006/Compilation%20of%20Maritime%20Law.pdf |2=Compilation of Maritime Law (U.S. 2006) |accesso=18 luglio 2010 |urlarchivio=https://web.archive.org/web/20070620212546/http://www.marad.dot.gov/Publications/Compilation%2006/Compilation%20of%20Maritime%20Law.pdf |dataarchivio=20 giugno 2007 |urlmorto=sì }}
*{{cita web|http://www.usmm.org/|American Merchant Marine at War - Revolution to World War II to today}}
*[https://web.archive.org/web/20110525150534/http://www.bts.gov/publications/maritime_trade_and_transportation/2002/index.html Maritime Trade & Transportation 2002] from the Bureau of Trade Statistics
*{{cita web|http://www.nps.gov/history/nr/twhp/wwwlps/lessons/116liberty_victory_ships/116liberty_victory_ships.htm|''“Liberty Ships and Victory Ships, America’s Lifeline in War”'', a National Park Service Teaching with Historic Places (TwHP) lesson plan}}