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Keywords from Image Description:
ONCE TOPSOIL IS REMOVED RAINWATER AND EXPOSED ROCK REACT TO FORM SULFURIC AND OTHER ACIDS WHICH EVENTUALLY POISON... NARA . Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor Calonius Erik Photographer File ONCETOPSOILISREMOVED RAINWATERANDEXPOSEDROCKREACTTOFORMSULFURICANDOTHERACIDSWHICHEVENTUALLYPOISON