Pamphlets on Conservation of Natural Resources, 6. sējums

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