thorium-dioxide paint
11Title 40 of the Code of Federal Regulations — Title 40 is a part of the United States Code of Federal Regulations. Title 40 arranges mainly environmental regulations that were promulgated by the US Environmental Protection Agency (EPA), based on the provisions of United States laws (statutes …
12Kaolinite — Kaolin General Category Silicate mineral Chemical formula Al2Si2O5(OH)4 …
13Copper — For other uses, see Copper (disambiguation) …
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