Is it possible to preserve the element of Unknown Places in our national life? Is it practicable to do so, without undue loss in economic values? I say 'yes' to both questions. But we must act vigorously and quickly, before the remaining bits of wilderness have disappeared.

The River of the Mother of God: and other Essays by Aldo Leopold (ed. Univ of Wisconsin Press, 1992) - ISBN: 9780299127633