File:1968. "Helicopter aerial spraying." Possibly the Sonny Boy Creek western hemlock looper control project on the Mt. Baker National Forest in Washington. (35260679693).jpg
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![File:1968. "Helicopter aerial spraying." Possibly the Sonny Boy Creek western hemlock looper control project on the Mt. Baker National Forest in Washington. (35260679693).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/1968._%22Helicopter_aerial_spraying.%22_Possibly_the_Sonny_Boy_Creek_western_hemlock_looper_control_project_on_the_Mt._Baker_National_Forest_in_Washington._%2835260679693%29.jpg/800px-thumbnail.jpg?20180508130708)
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