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Appalachian Trail Conference areas avoid bevel blade blazes bleeder blowdowns bolt bow saw brush build cairns clear corduroy crib crosscut saw damage debris deterioration diameter drainage durable edge eroded erosion feet flagging tape flat foot traffic footpath footway grade gully handle hardwood heavy hikers hiking inches land layout ledge letters lf possible limbs lopping shears main Trail mattock nails notch paint parking pond prevent problem pruning saws puncheon recreation relocation remove require road crossings rock route the Trail router safety scenic section of Trail sharpening shovel side trail sidehill trail signboard soil spikes stable steep slopes stencil steps stile stones stream surface switchbacks swizzle stick terrain timber Trail clubs trail construction Trail design Trail section trail systems trailhead trampling treadway tree trench U.S. Forest Service waterbars wear wedges weeder wheel wood