Conservation in the United States /
Conservation in the United States /
by A. F. Gustafson ... [et al.].
- 3rd ed.
- Ithaca : Comstock Publishing Associates, 1949.
- ix, 534 p. : ill., maps. ; 24 cm.
'Selections for supplementary reading': p. 513-520.
Natural resources.
United States--Economic conditions.
'Selections for supplementary reading': p. 513-520.
Natural resources.
United States--Economic conditions.
