@book{245650,
	author = {Paulson, Richard e. and Lawson, Chester a.},
	title = {Laboratory and field studies in biology : a sourcebook for secondary schools},
	publisher = {Holt, Rinehart and Winston},
	year = {1960},
	address = {New York},
	edition = {Teacher edition},
	note = {Donación Dr. Federico B. Vervoorst}
}