Conservation in the United States A. F. Gustafson, H. Ries, C. H. Guise, [and] W. J. Hamilton, Jr. - Gustafson, Axel Ferdinand 1880-; Ries, Heinrich 1871-.; Guise, Cedric Hay 1890-.; Hamilton, William John 1902-. (Ithaca, N. Y. Comstock publishing company, 1949)
pt. I. Conservation of soil and water resources, by A. F. Gustafson.--pt. II. Conservation of forest, parks, and grazing lands, by C. H. Guise.--pt. III. Conservation of wildlife, by W. J. Hamilton, Jr.--pt. IV. Conservation of mineral resources, by H. Ries.
"Selections for supplementary reading": p. [513]-520.
Keywords: Natural resources; United States -- Economic conditions