Wilderness and the American mind
1967
Nash, Roderick |
United States
The first resource : wild species in the North American economy
1986
Prescott-Allen, Christine |
Prescott-Allen, Robert |
Extinction is forever : the status of threatened and endangered species of plants in the Americas and their significance in ecosystems today and in the future
1977
Elias, Thomas S. |
Prance, Ghillean T. |
Man on the landscape : the fundamentals of plant conservation
1949
Carter, Vernon Gill |
Farmland, food and the future
1979
Schnepf, Max |
The future of the North American granary : politics, economics and resource constraints in North American agriculture
1986
Runge, C. Ford |
Wetlands : status and trends in the conterminous United States mid-1970's to mid-1980's : first update of the national wetlands status report
1991
Dahl, Thomas E. |
Johnson, Craig E. |
Wetlands losses in the United States 1780's to 1980's
1990
Dahl, Thomas E. |