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ACRICULTURE FOREST SERVICE aerial photos 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 curves cycloheximide DEPARTMENT OF ACRICULTURE diameter Division of Forest Douglas-fir dwarfmistletoe Engelmann spruce estimates Figure Forest and Range Forest Service Research Forest Survey Forestry fuel bed fuel moisture percents germination grand fir ground growing stock growth headfires Idaho illus inches d.b.h. infected Intermountain Forest lodgepole pine meter method million acres Montana mulch National Forest ownership classes parallax period photo measurement pine needles plots ponderosa pine potential classes pressure probe Range Experiment Station Range Expt rate of spread regeneration Research ABSTRACT sample seed seedbeds Service Research Note shipments snow soil moisture species Spread Index station OCDEN UTAH strain gages Table temperature thermocouples timber type treatment U.S. Forest Service UNITED STATES DEPARTMENT volume western larch western white pine