@book{22712,
	author = {Joint Committee on Soil Tilth. and Shaw, Byron T     },
	title = {Soil physical conditions and plant growth,},
	publisher = {Academic Press,},
	year = {c1952.},
	series = {Agronomy, a series of monographs},
	address = {New York :},
	note = {p.485-490}
}