@book{92650,
	author = {Symposium of British Ecological Society on Ecological Aspects of the Mineral Nutrition of Plants, Sheffield, Apr. 1-5, 1968.},
	title = {Ecological aspects of the mineral nutrition of plants; (proceedings)},
	publisher = {Blackwell},
	year = {c 1969},
	series = {The British Ecological Society Symposium; no.9},
	address = {Oxford}
}