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===National Toxicology Program===
===National Toxicology Program===
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The [[National Toxicology Program]], part of the [[U.S. Department of Health and Human Services]], classifies carcinogens in two categories: ''Known'', and ''Reasonably anticipated''.<ref name="NTP">National Toxicology Progam: [http://ntp.niehs.nih.gov/index.cfm?objectid=03CA6383-9766-1F64-6637241FE0114FE9 Questions & Answers about the RoC].</ref> Since 1978, it has produced a list of carcinogenic material along with federal regulations limiting exposure.<ref name="NTP">
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The [[National Toxicology Program]], part of the [[U.S. Department of Health and Human Services]], classifies carcinogens in two categories: ''Known'', and ''Reasonably anticipated''.<ref name="NTP">National Toxicology Progam: [http://ntp.niehs.nih.gov/index.cfm?objectid=03CA6383-9766-1F64-6637241FE0114FE9 Questions & Answers about the RoC].</ref> Since 1978, it has produced a list of carcinogenic material along with federal regulations limiting exposure.<ref name="NTP"/>