@book{26066,
	author = {Ronaldson, James Henry. and Imperial Institute (Great Britain)},
	title = {Coal,},
	publisher = {John Murray,},
	year = {1920.},
	series = {Great Britain. Imperial institute. Mineral resources committee. Monograph on mineral resources, with special reference to the British Empire},
	address = {London,},
	note = {Prepared under the direction of the Mineral resources committee of the Imperial institute, with the assistance of the scientific and technical staff.}
}