One-year OSHA compliance calendar : april 1991 through march 1992 : for rules promulgated under the occupational safety and health act through december 31, 1999 / Bureau of National Affairs. —  Washington, D.C. : BNA, [1991?]. —  CIDIMA. —  p. ; 28 cm. — 
    ISBN [s. n.]
   1. Seguridad en el trabajo.2. Higiene industrial.3. Salud laboral.4. Programas. I. Bureau of National Affairs.