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- Library of Congress. Congressional Research Service490
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- United States. General Accounting Office84
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- United States. Immigration and Naturalization Service63
- United States. Congress. House. Committee on the Judiciary62
- United States. Government Accountability Office61
- United States. Congress. House. Committee on the Judiciary. Subcommittee on Immigration, Border Security, and Claims58
- United States. Congress. House. Committee on Immigration and Naturalization56
- United States. Congress. House. Committee on the Judiciary. Subcommittee on Immigration and Claims56
- Project Muse50
- United States. Congress. House. Committee on the Judiciary. Subcommittee on Immigration, Refugees, and International Law49
- United States. Congress. Senate. Committee on the Judiciary44
- United States. Department of Homeland Security. Office of Inspector General, author38
- United States. Congress. House. Committee on the Judiciary. Subcommittee on Immigration, Citizenship, Refugees, Border Security, and International Law34
- Pan American Union. General Legal Division29
- United States. Congress. House. Committee on the Judiciary, author27
- Smith, Hillel R.25