@book{25365,
	author = {Welch, R. M, and Gabelman, W. H,},
	title = {Crops as Sources of Nutrients for Humans: Proceedings of a Symposium Sponsored by Divisions S-4 and C-6 of the Soil Science Society of America, Crop Science Society of Agronomy in Anaheim Calif., 28 nov - Dic 1982 /},
	publisher = {Soil Science Society of America,},
	year = {1984.},
	series = {Asa Special Publication Number 48},
	address = {Madison :},
	note = {Incluye Bibligrafía.}
}