The image of the frontier is probably one of the oldest images of mankind, and it is not surprising that we should find it hard to get rid of.
Kenneth E. Boulding, Harold J. Barnett, Rene Dubos, Leonard J. Duhl, Ralph Turvey, Roland N. McKean, Allen V. Kneese, M. Mason Gaffney, Gilbert F. White, David Lowenthal, Norton E. Long, Jacob H. Beuscher (1966). “Environmental Quality in a Growing Economy”
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