National parks and reserves - Law and legislation - United States.

Our common lands : = defending the national parks / by: (Language materials, printed)

Islands under siege : = national parks and the politics of external threats / by: (Language materials, printed)

Managing National Park system resources : = a handbook on legal duties, opportunities and tools / by: (Language materials, printed)

National parks and reserves- Government policy- United States.

Environmental policy- United States.

Conservation of natural resources- Law and legislation- United States.

Environmental law- United States.

National parks and reserves- Law and legislation- United States.

National parks and reserves- Management.- West (U.S.)

Transboundary pollution- West (U.S.).