@book{12081,
	author = {Allmaras, R. R.},
	title = {Total porosity and random roughness of the interrow zone as influenced by tillage},
	publisher = {Agricultural Research Service, U.S. Dept. of Agriculture},
	year = {[1966]},
	series = {United States. Dept. of Agriculture. Conservation research report},
	address = {Washington]}
}