O'Rourke, Ronald. Coast Guard Polar Icebreaker Modernization: Background, Issues, and Options for Congress, report, July 6, 2011; (https://digital.library.unt.edu/ark:/67531/metadc808833/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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