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1
Repairing paradise the restoration of nature in America's national parks /
Опубликовано 2009An electronic book accessible through the World Wide Web; click to view
Электронный ресурс eКнига -
2
Conservation and the gospel of efficiency : the progressive conservation movement, 1890-1920 /
Опубликовано 1999An electronic book accessible through the World Wide Web; click to view
Электронный ресурс eКнига