1. 21st Century Nanotechnology Research and Development Act. Public Law 108-153,2003; 15 USC 7501 (available fromhttp://thomas.loc.gov/cgi-bin/bdquery/z?d108:s.00189: accessedFebruary 2008).
2. Nanotechnology Environmental and Health Implications Working Group. Strategy for Nanotechnology-Related Environmental, Health, and Safety Research, February2008. National Nanotechnology Initiative Web site.http://www.nano.gov/NNI_EHS_Research_Strategy.pdf(accessedFebruary 2008).
3. EPA Office of Research and Development. Draft Nanomaterial Research Strategy (NRS), January 24,2008. U.S. Environmental Protection Agency Web site.http://es.epa.gov/ncer/nano/publications/nano_strategy_012408.pdf(accessedFebruary 2008).