File:1977. Helicopter spraying insecticide. Western spruce budworm control project. Okanogan Unit. Okanogan National Forest, Washington. (36362336093).jpg
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![File:1977. Helicopter spraying insecticide. Western spruce budworm control project. Okanogan Unit. Okanogan National Forest, Washington. (36362336093).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/1977._Helicopter_spraying_insecticide._Western_spruce_budworm_control_project._Okanogan_Unit._Okanogan_National_Forest%2C_Washington._%2836362336093%29.jpg/800px-1977._Helicopter_spraying_insecticide._Western_spruce_budworm_control_project._Okanogan_Unit._Okanogan_National_Forest%2C_Washington._%2836362336093%29.jpg?20180508132001)
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