@book{38832,
	author = {Instituto Internacional de la Potasa},
	title = {Potasium... Symposium, 1954-},
	publisher = {El Instituto,},
	year = {1954-},
	address = {Zurich :},
	note = {La biblioteca tiene: 1954, 1955, 1956, 1957, 1958, 1960, 1962, 1970}
}