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