@book{18304,
	author = {Kipps, Michael Smith, and Wolfe, T. K.},
	title = {Production of field crops :},
	publisher = {McGraw-Hill,},
	year = {1970.},
	series = {McGraw-Hill publications in the agricultural sciences},
	address = {New York :},
	edition = {6th ed.},
	note = {Fifth ed. by T. K. Wolfe and M. S. Kipps.}
}