@book{17577,
	author = {Walden, A.T.},
	title = {Statistical methods in environmental and earth sciences :},
	publisher = {Edward Arnold,},
	year = {c1992.},
	address = {London :},
	note = {GB92-00227},
	url = {http://www.loc.gov/catdir/enhancements/fy0639/93158960-d.html}
}