| http://www.w3.org/ns/prov#value | - Formaldehyde is used to produce a wide array of products, particularly building materials; it is emitted from many sources, including power plants, cars, gas and wood stoves, and...http://books.google.com/books/about/Review_of_the_Environmental_Protection_A.html?id=1vcUaPkxHDcC&q=chemical&utm_source=gb-gplus-shareReview of the Environmental Protection Agency's Draft IRIS Assessment of Formaldehyde
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