1. Sigurd F. Olson, "Some Thoughts onWilderness Values," Quetico Newsletter,Toronto: Quetico Foundation, December31, 1959, p. 2OlsonSome Thoughts on Wilderness Values2Quetico Newsletter1959
2. C. Frank Brockman, Recreational Useof Wild Lands, New York: McGraw-Hill,1959, p. 185.Brockman185Recreational Use of Wild Lands1959