@book{151580,
	author = {Ruark, J.R. and United States of America. Department of the Interior and Sohns, H.W.},
	title = {Gas combustion retorting of oil shale under anvil points lease agreement: Stage II},
	publisher = {Bureau of Mines},
	year = {1971},
	series = {Bureau of Mines Report of Investigations},
	address = {United States of America}
}