Phone call to Niosh, 7/31/79 (name of Bureau of Occupational Safety and Health changed to National Institute for Occupational Safety and Health in 1971 with passage of Occupational safety and health act of 1970)
NIOSH report on occupational safety ... 1982 t.p. (U.S.; Centers for Disease Control, National Institute for Occupational Safety and Health)
Los Angeles Times, Los Angeles, California, 1993 t.p. (U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health)
Building air quality action plan, 1998 t.p. (National Institute of Occupational Safety and Health)
Una guia para trabajar sin peligro con silice, 2002? t.p. (Instituto Nacional de Seguridad y Salud Ocupacional) p. 19 (NIOSH)
