United States. Government Accountability Office. Immigration Enforcement: Better Controls Needed over Program Authorizing State and Local Enforcement of Federal Immigration Laws, report, January 30, 2009; (https://digital.library.unt.edu/ark:/67531/metadc302915/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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