User talk:142.157.128.27
November 2011[edit]
Welcome to Wikipedia. Although everyone is welcome to contribute constructively to the encyclopedia, adding or significantly changing content without citing a reliable source, as you did with this edit to Calcium carbonate, is not consistent with our policy of verifiability. Take a look at the welcome page to learn more about contributing to this encyclopedia. If you are familiar with Wikipedia:Citing sources, please take this opportunity to add references to the article. Velella Velella Talk 22:40, 12 November 2011 (UTC)
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