Gerry Ellis / Gas effluence pouring out of smoke stacks at nuclear power plant, upper Ohio River, Ohio
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Doug Wechsler / Great Falls of the Potomac, Chesapeake and Ohio Canal National Historical Park, Maryland, USA July
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Jack Dykinga / Autumnal landscape with Sugar maple (Acer saccharum) and American beech (Fagus grandifolia) forest, and Blue Hen Falls, Cuyahoga Valley National Park, Ohio, USA, October 2006.
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Gerry Ellis / Gas effluence from nuclear power plant, upper Ohio River, Ohio
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Joel Sartore / Photo Ark / Ohio lamprey (Ichthyomyzon bdellium) flipping over to reveal its oral disc, Little River, Tennessee, USA. Controlled conditions.