@book{16941,
	author = {American Society of Agronomy. ASA.},
	title = {Moving up the yield curve :},
	publisher = {American Society of Agronomy :},
	year = {1980 (reimp.1983)},
	series = {ASA special publication ;},
	address = {Madison, WI :},
	note = {Proceedings of a symposium .. Chicago,Il. 3-8 Dec.1978.}
}