@book{104820,
	author = {Clay, David E.},
	title = {GIS Applications in agriculture /},
	publisher = {CRC Press,},
	year = {2011.},
	series = {GIS applications in agriculture series},
	address = {Boca Raton, FL. :},
	note = {Labiblioteca tiene v.2 y v.3}
}