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acres American Annually available apparatus areas Assigned to Prof atom Begun Bulletin Bureau calcite cathode rays chemical chemists Company completed continued cooperation deﬁnite Department determine diﬁerent District Douglas ﬁr Duane eﬁect electric electron emission energy Engelmann spruce engineers established experimental ﬁeld ﬁnd ﬁre ﬁrst ﬁve Forest Products Forest Products Laboratory Forest Service Forestry frequency grazing growth inﬂuence insects intensity investigation J. A. Larsen kiln Laboratory lines Lodgepole pine manufacture Marine Biological Laboratory measured Medical College methods National Forest National Research Council Norway spruce nursery oﬁicers oﬂicers Original fund Phys planting prepared Present fund Priest River problems published pulp radiation range reﬂection remeasured reproduction Research staff rhodium Ribes sample plots scientiﬁc seed species spruce tests timber tion University Unusual equipment wave-length western larch Western white pine western yellow pine white pine wood X-rays