He'd won the book in an Arbor Day poster contest for schoolkids that had coincided with a citywide tree-planting program administered by the Department of Parks and Public Property.

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The design of his winning poster was based on a red two-cent stamp in my collection commemorating the sixtieth anniversary of Arbor Day.

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The final day included a tour of the Environmental Protection Agency testing facility in Ann Arbor, and at the Michigan International Speedway, where the Progressive Insurance Automotive X PRIZE competition teams were testing their self-made, eco-friendly cars right on the race track.

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For each tree used in production, 100 are replanted through Vers' partnership with The Arbor Day Foundation and the U.S. Forestry Service.

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