http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
U.S. Department of Labor, Bureau of Labor Statistics.
GPO Cataloging Record Distribution Program (CRDP).
Industry wage survey. Help supply services
Industry wage survey. Temporary help supply
Occupational compensation survey. Temporary help supply services
Bulletin of the United States Bureau of Labor Statistics