@book{2881,
	author = {Troeh, Frederick R. and Thompson, Louis M.},
	title = {Soils and soil fertility /},
	publisher = {Oxford University Press,},
	year = {1993.},
	address = {New York :},
	edition = {5th ed.},
	note = {Thompson's name appears first on the previous edition.},
	url = {http://www.loc.gov/catdir/enhancements/fy0606/93003904-d.html}
}