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The Fourth World Wilderness Conference
4th. World Wilderness Congress Foundation 1989 : http://www.youtube.com/watch?v=RJ1_OUKyTlE
World Wilderness Congress: http://en.wikipedia.org/wiki/World_Wilderness_Congress
Accomplishments of the 4th World Wilderness Congress:
The World Wilderness Congress: http://www.wilderness.net/library/documents/martin2.pdf