. . "Coal." . . "Coal Testing." . . "Carbón Análisis" . . . . . . "Mine sampling and chemical analyses of coals tested at the United States Fuel-Testing Plant, Norfolk, Va. in 1907"@en . "Mine sampling and chemical analyses of coals tested at the United States fuel-testing plant, Norfolk, Va., in 1907, by John Shober Burrows" . . . . . "Mine sampling and chemical analyses of coals tested at the United States fuel-testing plant Norfolk, VA., in 1907" . . . . . "Mine sampling and chemical analyses of coals : tested at the United States Fuel-Testing Plant Norfolk, VA. in 1907" . . . . . . "Mine-sampling and chemical analyses of coals tested at the U.S. Fueltesting Plant Norfolk, VA., in 1907" . . . "The USGS tested coal from the Pocahontas and New River coalfields, West Virginia/Virginia (used by Atlantic seaboard industrial plants, the U.S. Navy and the merchant marine), to determine the best methods of using it economically."@en . . "Mine sampling and chemical analyses of coals tested at the United States fuel-testing plant, Norfolk, Va. in 1907" . . . . . . . "Geological Survey (U.S.)," . .