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He 20. 432 :Sm 2/Cd/Span. : Listos, en sus marcas--escuchen! : el juego / U.S. Dept. of Health and Human Services, Substance Abuse and Mental Health Services Administration, Center for Substance Abuse Prevention.
He 20. 502 :98012310 : Agency for Toxic Substances and Disease Registry Methyl Parathion Expert Panel report : April 24-25, 1997, Atlanta, Georgia.
He 20. 502 :98014850 : Public health advisory : Trinity American Corp., Glenola Industrial Drive, Randolph County, North Carolina / U.S. Department of Health and Human Services, Agency for Toxic Substances and Disease Registry, Division of Health Assessment and Consultation.