@book{246869,
	author = {Gilkey, Helen M. and Steward, Albert N.},
	title = {Aquatic plants of the Pacific Northwest with vegetative keys},
	publisher = {Oregon State University Press},
	year = {1963},
	address = {Corvallis, Oregon},
	edition = {2nd ed.},
	note = {Oregon State Monographs, Studies in Botany 11.  Donación T. M. Pedersen}
}