Environmental protection - History - 20th century. - United States

FDR and the environment by: (書目-電子資源)

The promise of wilderness = American environmental politics since 1964 / by: (書目-電子資源)

Wilderness areas- 20th century.- United States

Conservation of natural resources- History- 20th century.- United States

Environmental protection- History- 20th century.- United States

Wilderness areas- Law and legislation- 20th century.- United States

United States- Social policy- 1993-

Roosevelt, Franklin D.

NATURE / Environmental Conservation & Protection.

New Deal, 1933-1939.

Environmental policy- History- 20th century.- United States

HISTORY / United States / 20th Century.

POLITICAL SCIENCE / Public Policy / Environmental Policy.