Conservation of natural resources /
editor: Guy-Harold Smith; contributors: Robert M. Basile ... [et al.].
- 4th ed.
- New York : Wiley, 1971.
- xiii, 685 p. : ill., maps.
0471801925
Conservation of natural resources--United States.
United States--Economic conditions.
0471801925
Conservation of natural resources--United States.
United States--Economic conditions.