@book{2841,
	author = {Johnson, Robert Britten. and Degraff, Jerome V.},
	title = {Principles of Engineering Geology },
	publisher = {John Wiley and Sons },
	year = {1988.},
	address = {New York},
	url = {http://www.amazon.com/exec/obidos/ASIN/0471612758/chopaconline-20}
}