File:1963. Mark Headings and Dennis Dokken count dead hemlock loopers. Hemlock looper control project in Southwest Washington. (32277667333).jpg
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![File:1963. Mark Headings and Dennis Dokken count dead hemlock loopers. Hemlock looper control project in Southwest Washington. (32277667333).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/1963._Mark_Headings_and_Dennis_Dokken_count_dead_hemlock_loopers._Hemlock_looper_control_project_in_Southwest_Washington._%2832277667333%29.jpg/425px-1963._Mark_Headings_and_Dennis_Dokken_count_dead_hemlock_loopers._Hemlock_looper_control_project_in_Southwest_Washington._%2832277667333%29.jpg?20180504000115)
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