Show 0 ALASKA TIMBER FOR MINING I 1 that mine timbers of white spruce sitka spruce white birch and western hemlock grown on the churach national forest alaska are fully as good as douglas fir from the rocky mountain region and are superior to other rocky mountain species for use as mine timbers has been demonstrated by the forest products laboratory at madison wisconsin tests made to determine the suitability of the alaskan trees for mine timbers showed that in bending strength developed the four species named are from froin 20 per cent to more than per cent stronger than lodgepole pine alpine fir engelmann spruce bristle cone pine and western yellow pine from the mountain region all of these species are widely used for mine anine timbers and were tested by the laboratory sitka spruce white birch and western hemlock from alaska proved to be considerably higher in average strength than rocky mountain douglas fir white spruce averaged nearly as well |