Proceedings of the Society of American Foresters, Volúmenes1-10

acre administration agricultural altitude American Foresters amount average beach grass Black Hills board feet branches brush burned bushel of cones cent climatic conkiness cost crop crown curves Del Norte County diameter district Douglas fir dune effect Engelmann spruce eucalyptus fact fire protection forest lands Forest Service forestry frustum form factor fungus germination grass grazing growing important inches increase inflammable material layer light measurements method Monterey pine mountains National Forests necessary period piles plants practice present problems production railroads ranger ranger school reason region reproduction sand secured seed per bushel seedlings silvical silviculture slash slope species spruce square miles stand stumpage sustained annual yield temperature timber timber plans tion tracheids trees volume tables western white pine wood yellow pine yellow-pine Poria yield management