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Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Coal deposits also contain metals, mostly iron and aluminum and trace amounts of arsenic, nickel, zinc, cadmium, cobalt, mercury, beryllium, and copper (Huang et al., 2005).
http://www.w3.org/ns/prov#wasQuotedFrom	federalregister.gov