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1
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2
Repairing paradise the restoration of nature in America's national parks
Baskı/Yayın Bilgisi 2009Kitap -
3
R & D status and directions (2000 and beyond) agricultural ecosystem.
Baskı/Yayın Bilgisi 2003Kitap -
4
The economics of Third World national parks issues of tourism and environmental management
Baskı/Yayın Bilgisi 1995Kitap -
5