@book{68742,
	author = {Delorit, Richard J. and Ahlgren, Henry Lawrence,},
	title = {Crop production /},
	publisher = {Prentice-Hall,},
	year = {1954, c1959},
	series = {Prentice-Hall vocational agriculture series},
	address = {Englewood Cliffs, N.J. :},
	edition = {2d ed.}
}