Pamphlets on Conservation of Natural Resources, Volumen6U.S. Government Printing Office, 1913 |
Dentro del libro
Resultados 1-5 de 66
Página 21
... effect of unrestrained competition in timber exploitation upon our forest resources should receive serious study . " sizes . The portion of the report dealing with the conditions which prevent closer utilization is in effect a reply to ...
... effect of unrestrained competition in timber exploitation upon our forest resources should receive serious study . " sizes . The portion of the report dealing with the conditions which prevent closer utilization is in effect a reply to ...
Página 23
... effect of forests in broad con- tinental valleys upon precipitation over continents . If this new theory is correct , as it seems to be , it provides even a greater justification for forest conservation than the accepted view of the ...
... effect of forests in broad con- tinental valleys upon precipitation over continents . If this new theory is correct , as it seems to be , it provides even a greater justification for forest conservation than the accepted view of the ...
Página 42
... effect of the work of one man , in the case of Doctor J. T. Rothrock , of Pennsylvania . The work that Doctor Rothrock has done is wonderful , and we have a great deal to give him credit for in our expansion of forestry afterwards as a ...
... effect of the work of one man , in the case of Doctor J. T. Rothrock , of Pennsylvania . The work that Doctor Rothrock has done is wonderful , and we have a great deal to give him credit for in our expansion of forestry afterwards as a ...
Página 52
... effect of sulphurous gases . The feasibility of planting by water companies is apparent by a brief survey of conditions and opportunities . Large areas have to be owned to protect the purity of supply . Such lands offer the best ...
... effect of sulphurous gases . The feasibility of planting by water companies is apparent by a brief survey of conditions and opportunities . Large areas have to be owned to protect the purity of supply . Such lands offer the best ...
Página 60
... effect in Wis- consin and Minnesota by which non - agricultural cut - over lands are being acquired for eventual reforestation . There is also commendable State activity in Michigan . The Federal Forest Service has begun planting on ...
... effect in Wis- consin and Minnesota by which non - agricultural cut - over lands are being acquired for eventual reforestation . There is also commendable State activity in Michigan . The Federal Forest Service has begun planting on ...
Términos y frases comunes
acres administration agricultural American Forestry Association amount annual average camp cent Chairman commercial companies conifers Conservation Congress consumer cooperation cost course Douglas fir effect eucalyptus favor Federal Government feet field fire protection fire wardens forest fires forest land forest law forest products forest protection forest schools Forest Service forest taxation Forestry Committee future grades growth hardwood important increase interest investment legislation logging lumber lumber industry lumbermen manufacturing meeting methods mill moisture mountains national forests operations Oregon organization patrol patrolmen planting possible practical precipitation present private forestry private owners problem profit property tax railroad ranger school reason reforestation region revenue sections secure silvicultural soil spark arresters species stumpage sub-committee supply timber land timber owners tion town trees utilization waste white pine woods yellow pine yield tax