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acres average back fire back-firing California camp campers cause cent charge construction cooperation cost cover crew damage district forester district ranger Douglas fir effective emergency Engelmann spruce equipment extinguish factor feet fire danger fire fighting fire lines fire protection fire season fire warden fire-fighting flash forest fireman forest fires Forest officer Forest Service Forestry fulgurite furnished heliograph horses inches inflammable inflammable material land lightning Lodgepole pine logging lookout points lookout station loss lumbermen methods miles miles of fire mountain National Forests necessary needed number of fires organization owner pack piling and burning possible railroad ranger district region reproduction secure slash slopes snags soil spark arresters standard sugar pine supervisor supplies telephone lines timber tion tower trails trees trench United Western yellow pine white fir wind wire wood young growth