File:1962. Entomologist Charles Sartwell with slash used for time-of-felling studies. Wildhorse Creek. Fremont National Forest, Oregon. (34999479662).jpg
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![File:1962. Entomologist Charles Sartwell with slash used for time-of-felling studies. Wildhorse Creek. Fremont National Forest, Oregon. (34999479662).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/54/1962._Entomologist_Charles_Sartwell_with_slash_used_for_time-of-felling_studies._Wildhorse_Creek._Fremont_National_Forest%2C_Oregon._%2834999479662%29.jpg/785px-1962._Entomologist_Charles_Sartwell_with_slash_used_for_time-of-felling_studies._Wildhorse_Creek._Fremont_National_Forest%2C_Oregon._%2834999479662%29.jpg?20180503235945)
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