@book{55155,
	author = {Hartman, Howard L. and Mutmansky, Jan M.},
	title = {Introductory mining engineering /},
	publisher = {Wiley,},
	year = {2014.},
	address = {New Delhi :},
	edition = {2nd ed.},
	url = {www.loc.gov/catdir/toc/wiley023/2002071315.html}
}