Twenty-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington

James W. Barrett | Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service | 1981

Twenty-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington

James W. Barrett | U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station | 1981

Twenty-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington

James W. Barrett | U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station | 1981

Twenty-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington

James W. Barrett | U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station | 1981

Twenty-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington

James W. Barrett | U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station | 1981

Twenty-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington

James W. Barrett | U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station | 1981