Symposium on Forestry and the Public Welfare: Papers Read Before the American Philosophical Society, Autumn General Meeting November 17, 1944American philosophical society, 1945 - 90 pages |
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Page 416
... cultivation rather than by clearing or reclaiming new land , important as that is . The area possible of cultivation in economic farming enterprises is 4 billion acres , or 2 acres per capita of the present world population . Land in ...
... cultivation rather than by clearing or reclaiming new land , important as that is . The area possible of cultivation in economic farming enterprises is 4 billion acres , or 2 acres per capita of the present world population . Land in ...
Page 417
... cultivation . Yet in this country the area of Class I land , that is , land requiring no special conservation measures under cultivation , is 71,808,000 acres , or 6.81 per cent , out of a total of 1,054,053,000 acres of land in farms ...
... cultivation . Yet in this country the area of Class I land , that is , land requiring no special conservation measures under cultivation , is 71,808,000 acres , or 6.81 per cent , out of a total of 1,054,053,000 acres of land in farms ...
Page 453
... cultivation , they had brought about such changes in the seasons that they were now able to cultivate crops which were unknown to their predecessors . They felt that a They felt that a new power had been placed at their disposal . In ...
... cultivation , they had brought about such changes in the seasons that they were now able to cultivate crops which were unknown to their predecessors . They felt that a They felt that a new power had been placed at their disposal . In ...
Contents
Forests in Relation to Soil and Water | 399 |
Worldwide Needs of Woods as a Land Conservation Crop | 408 |
Americas Role in Meeting World Timber Needs | 418 |
3 other sections not shown
Common terms and phrases
agricultural American forest American Philosophical Society André François André Michaux ashes billion burning cedar cent century clearing climate cooperation corn crop cubic feet cultivation deforestation destruction developed district economic especially Europe European farm felled fence fire forest conservation forest industries forest land forest owners forest products Forest Service Forests and Parks fuel Government ground growing growth Humphrey Marshall hundred important improvement cutting increase JEREMY BELKNAP John Bartram John Evelyn labor Lebanon less logs lumber lumber industry manufacture mast measures ment Michaux mountains nature needs November 17 operation ownership paper pasture Pennsylvania Philadelphia pine plants pot ashes present problem protection public ownership pulp pulpwood raw materials region Regulation settlements settlers ship slopes soil stands stumps supply surface runoff timber timber products timberland tion tracts Travels trees United Virginia wind wood products wood pulp woodland woodlot