@book{71159,
	author = {Tandanand, Sathit.},
	title = {Development of a mechanical roof breaker for ground control in longwall operations under massive roof},
	publisher = {Dept. of the Interior, Bureau of Mines},
	year = {1979.},
	series = {Report of investigations - United States Department of the Interior, Bureau of mines},
	address = {Washington}
}