File:Vintage schedule from an environmental conference at the University of Michigan.png
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![File:Vintage schedule from an environmental conference at the University of Michigan.png](https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Vintage_schedule_from_an_environmental_conference_at_the_University_of_Michigan.png/800px-Vintage_schedule_from_an_environmental_conference_at_the_University_of_Michigan.png?20190207201042)
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