United States. Department of Homeland Security

Estimates of the Unauthorized Immigrant Population Residing in the United States: January 2009

M. Peter Hoefer, Bryan Baker, Nancy F. Rytina · 2009 · 422 citations

Social Sciences, Demography, Demographic Methods +14

Estimates of the Unauthorized Immigrant Population Residing in the United States: January 2006

Nancy F. Rytina · 2007 · 57 citations

Planning, Emergency Planning, Census Analysis +8

Advisory Memorandum on Identification of Essential Critical Infrastructure Workers During COVID-19 Response

Christopher Krebs · 2020 · 47 citations

Planning, Emergency Medicine, Emergency Preparedness +16

Recommended Practices Guide for Securing ZigBee Wireless Networks in Process Control System Environments: Draft

Ken Masica · 2007 · 29 citations

Computing, Computer Science, Cybersecurity +16

Statement of Secretary Michael Chertoff, U.S. Department of Homeland Security before the United States Senate Committee on Commerce, Science and Transportation, Tuesday, July 19, 2005, Washington, DC

Michael Chertoff · 2005 · 22 citations

Social Sciences, Political Science, American Politics +8