@book{34859,
	author = {Keller, Edward A., and Burt, E. M.},
	title = {Environmental geology /},
	publisher = {Merrill Pub. Co.,},
	year = {�1988.},
	address = {Columbus :},
	edition = {5th ed.},
	url = {http://www.gbv.de/dms/bowker/toc/9780675208895.pdf}
}