Farmers' Bulletin, Ausgabe 1417U.S. Government Printing Office, 1924 |
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25 BILLION CUBIC 27 BILLION CUBIC 470 million acres 81 million acres acres of forest areas of denuded average billion board feet billion cubic feet capita consumption cent commercial timber consumer consumption of wood cost of forest cut annually cut-over forest lands cut-over land denuded land Eastern economic enormous farm forest crops forest growth forest owners forest patrols forest products grow forests grow timber Growing trees hardwood idle forest lands idle land increased industries less logging camp Michigan township national habits navigable streams nearly private ownership protection public agencies public aid public ownership publicly owned forests pulpwood railroad reforestation regrown require saw timber sawmills Siberia softwood staple crop stumpage supply of timber temporary and exhaustible thousand feet timber culture timber growing timber supply to-day tree planting United virgin forest virgin timber watersheds Weeks law wood grown wood-using yearly drain yellow pine young trees