@book{205725,
	author = {Pubols, Ben H. and Heisig, Carl P.},
	title = {Ferming systems and practices and their relations hip to soil conservation and farm income in the wheat region of Washington  /},
	publisher = { State College of Washington. Agricultural Experiment Station},
	address = {Washington  :},
	note = {Enc. con otros impresos similares}
}