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Smith, A.H.V. (1997). "Provenance of Coals from Roman Sites in England and Wales". They have a reasonable risk of ignition hazard in the event that they make unintended contact with furnishings. They operate silently and ejuiceuk have a decrease risk of ignition hazard in the event that they make unintended contact with furnishings in comparison with radiant electric heaters. Combines with different oxides to make sulfates.

Kentucky Geological Survey. University of Kentucky. U.S. Geological Survey Bulletin.

U.S. Energy Information Administration (EIA). U.S. Environmental Protection Agency. Radiant heaters function silently and vapemode current the best potential hazard of ignition of nearby furnishings because of the targeted intensity of their output and lack of overheat protection.