Cargo Preference 1 : Cargo reserved by a Nation's laws for transportation only on vessels registered in that Nation. Typically the cargo is moving due to a direct or indirect support or activity of the Government
US Department of Transportation, Maritime Administration, Glossary of Shipping Terms, Washington, DC, USA 2008. http://www.marad.dot.gov/documents/Glossary_final. pdf, (Mrtm - Amer) {572}