- found: The Amer. Heritage dict. of the Engl. lang., via WWW, Oct. 18, 2001 (calcium: A silvery, moderately hard metallic element ... It occurs naturally in limestone, gypsum, and fluorite, and its compounds are used to make plaster, quicklime, Portland cement, and metallurgic and electronic materials)
- 2001-10-18: new
- 2001-12-12: revised
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