Figure 1-1 Apprehensions of unauthorized immigrants, 2001-2010.
SOURCE: Data from U.S. Department of Homeland Security, 2011b:Table 35.
Figure 1-2 U.S. Border Patrol sectors along the U.S.–Mexico border.
NOTE: The sectors are San Diego and El Centro in California; Yuma and Tucson in Arizona; and El Paso, Marfa, Del Rio, Laredo, and Rio Grande Valley in Texas.
SOURCE: U.S. Government Accountability Office, 2011b:2.
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1 Introduction ."
Estimating Illegal Entries at the U.S.-Mexico Border . Washington, DC: The National Academies Press,
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