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aerial photos AGRICULTURE FOREST SERVICE average backﬁres basal area board-foot burning calibration Christmas tree Coconino National Forest commercial forest land cones Creek cross drains cubic feet cumulated fuel moisture curve cycloheximide DEPARTMENT OF AGRICULTURE Division of Forest Douglas-ﬁr dwarfmistletoe Engelmann spruce ﬁeld ﬁg ﬁgures ﬁr ﬁre ﬁrst Forest and Range Forest Service Research Forest Survey fuel bed gage germination ground growing stock headﬁres Idaho illus inches d.b.h. infected Intermountain Forest limber pine lodgepole pine meter million acres Montana National Forest OGDEN UTAH U.S. ownership classes parallax period photo measurement pine needles plots ponderosa pine pressure probe production Range Experiment Station Range Expt regeneration Research ABSTRACT Research Forester seed seedbeds Service Research Note shipments signiﬁcant signiﬁcantly soil moisture species STATION OGDEN UTAH strobilus Table temperature thermocouples timber type treatment U.S. Forest Service UNITED STATES DEPARTMENT UTAH U.S. Forest volume Western larch western white pine