@book{25145,
	author = {Porter, J. B. and Durley, R. J. and Canada.},
	title = {An investigation of the coals of Canada},
	publisher = {Government printing bureau,},
	year = {1912-15.},
	series = {Canada. Dept. of mines. Mines branch. [Report no. 83]},
	address = {Ottawa,},
	note = {Vol. 7 is extra volume supplementing report no. 83.}
}