Pamphlets on Conservation of Natural Resources, Volumen18U.S. Government Printing Office, 1909 |
Dentro del libro
Resultados 1-5 de 100
Página 231
... to mine and process most minerals . There- fore iron ore was not useful to him , even though rich deposits were right under his feet . American Indians used the Great Plains for hunt- ing , but they lacked the tools and the techniques 3.
... to mine and process most minerals . There- fore iron ore was not useful to him , even though rich deposits were right under his feet . American Indians used the Great Plains for hunt- ing , but they lacked the tools and the techniques 3.
Página 233
... minerals . When the day comes that these are so scarce that they are too costly to extract and process , and when the goods made from them are all consumed , their utility to man will be so severely limited they may be considered non ...
... minerals . When the day comes that these are so scarce that they are too costly to extract and process , and when the goods made from them are all consumed , their utility to man will be so severely limited they may be considered non ...
Página 234
... minerals , the productivity of each of these resources is dependent on each of the others . Soils cannot produce crops without water ; run - off cannot be delayed nor water stored and maintained in the ground without forests and ...
... minerals , the productivity of each of these resources is dependent on each of the others . Soils cannot produce crops without water ; run - off cannot be delayed nor water stored and maintained in the ground without forests and ...
Página 273
... interdependence of forest and grass cover , water , animal life , productive soils and minerals and the land which is threatened when the ' chain of life ' is broken . This film received the 1950 Award of Merit established by 45.
... interdependence of forest and grass cover , water , animal life , productive soils and minerals and the land which is threatened when the ' chain of life ' is broken . This film received the 1950 Award of Merit established by 45.
Página 275
... Minerals In The Soil Water And The Soil Animal Life And The Soil How Long Will It Last ? How Man Has Used The Soil How Man Conserves The Soil Title Myah RECOMMENDED INDUSTRIAL FILMS Your Valley , Your Future American Frontier Battle Of ...
... Minerals In The Soil Water And The Soil Animal Life And The Soil How Long Will It Last ? How Man Has Used The Soil How Man Conserves The Soil Title Myah RECOMMENDED INDUSTRIAL FILMS Your Valley , Your Future American Frontier Battle Of ...
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Términos y frases comunes
acres agencies Agriculture annual areas bill boys Bureau CAGNEY camp Chairman Civilian Conservation Corps Commission committee Congress conservation movement Construction cooperation coordination cost Council delinquency Department Douglas-fir economic enrollees existing facilities Federal Government fire Forest Fire forest land FOREST PROTECTION Forest Service forestry Gifford Pinchot Governor habitat important improvements increase industry Insect and Disease interest Interior January 26 juvenile Kalamazoo River labor legislation Maintenance Management and administration ment miles million acres mineral national forests national-forest natural resources organization parks percent plans planting population present President problems production proposed recommendations recreation Reforestation regional resource development Resource Management Resources and Conservation responsibility river roads and trails Senator CLARK Senator Humphrey SENATOR MURRAY Senator RANDOLPH Silviculture statement streams surveys Theodore Roosevelt Timber purchasers tion U.S. Senate United utilization Washington watershed welfare wildlife young Youth Conservation Corps