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The USFS uses a reflective thumb tack to mark trails for seismic sensor and camera placements. They are hardly visible during daylight and show well when light is reflected on them at night, they make for nice trail markings,if using a light.
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"It is because they have so much to give and give it so lavishly...that men love the mountains and go back to them again and again." Sir Francis Younghusband
Essayons
By Dand
"In the school of the wilds,there is no graduation day"Horace Kephart
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