Pamphlets on Conservation of Natural Resources, Volumen18U.S. Government Printing Office, 1909 |
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Página 225
... sources . 1945 . Sears , P.B. Science and natural resources . Taft , W.H. , Pres . U.S. 1956 . Conservation of national resources ; special message of the President of the United States transmitted to the two houses of Congress Jan ...
... sources . 1945 . Sears , P.B. Science and natural resources . Taft , W.H. , Pres . U.S. 1956 . Conservation of national resources ; special message of the President of the United States transmitted to the two houses of Congress Jan ...
Página 233
... sources that can be replaced , and resources that are inexhaustible . In- cluded in the first category are all metals and most minerals . When the day comes that these are so scarce that they are too costly to extract and process , and ...
... sources that can be replaced , and resources that are inexhaustible . In- cluded in the first category are all metals and most minerals . When the day comes that these are so scarce that they are too costly to extract and process , and ...
Página 235
... source of en- ergy . However , even if the nation's hydroelectric resources were com- pletely developed , they would be insufficient to supply more than a quarter of our energy needs . There is only a finite quantity of both rock and ...
... source of en- ergy . However , even if the nation's hydroelectric resources were com- pletely developed , they would be insufficient to supply more than a quarter of our energy needs . There is only a finite quantity of both rock and ...
Página 236
... source interrelations . The most economical use of resources requires not only the skill of the trained scientist and technician , but the understanding and interest of the ordinary citizen - because on him rests the ultimate ...
... source interrelations . The most economical use of resources requires not only the skill of the trained scientist and technician , but the understanding and interest of the ordinary citizen - because on him rests the ultimate ...
Página 243
... sources of pollution are industrial and municipal wastes and sewage . Most of our great rivers are contaminated as are many of our once clear streams . Even the Great Lakes are not free of pollution . Many of our mid - western rivers ...
... sources of pollution are industrial and municipal wastes and sewage . Most of our great rivers are contaminated as are many of our once clear streams . Even the Great Lakes are not free of pollution . Many of our mid - western rivers ...
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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