@book{16969,
	author = {Van Doren, D. M. and American Society or Agronomy. ASA},
	title = {Predicting tillage effects on soil physical properties and processes :},
	publisher = {American Society of Agronomy :},
	year = {1982[reimp.1985]},
	series = {ASA special publication ;},
	address = {Madison, WI :},
	note = {"The papers were presented during the Annual Meetings in Detroit, Mi., November 30-Dec.5, 1980".}
}