@book{428,
	author = {Ritchey, Joseph D.,},
	title = {Subsurface fluid flow (ground-water and vadose zone) modeling /},
	publisher = {ASTM,},
	year = {c1996.},
	series = {STP ;},
	address = {West Conshohocken, Pa. :},
	note = {Papers from a symposium held June 22-23, 1996, in Denver Colo.}
}