Hagen, Virginia M. The Latin American-United States Fishing Rights Controversy: Dilemma for United States Foreign Policy (1969-1971), report, April 15, 1971; (https://digital.library.unt.edu/ark:/67531/metadc992685/m1/1/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .