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Studies in identification of North American forest trees
Object of the publication
Description of the different lines of investigationContinued Page
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acres Agriculture amount annual application association average brush capital carried cent charge companies cooperation cost cover crop Department depreciation determine district Division effect entire established estimated experiment extent fall farm farmers feet fire Forest Service forestry furnish give given Government grade grazing ground growing growth important improvements inches increase interest investment kinds land less lines logging lumber material methods miles mill mountain National Forests natural necessary obtained officers operation owners period pine planting possible practical present profit protection railroad range region reproduction reserves season secure seed seedlings soil sowing species spring stand stations streams studies stumpage supply taken telephone tests timber tion trail trees United usually various wood yellow