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Colorado, Colorado National Parks

Indian Springs Trace Fossil Site

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Illinois, Illinois National Parks

Illinois & Michigan Canal National Heritage Corridor

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Illinois, Illinois National Parks

Illinois Beach Nature Preserve

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Florida, Florida National Parks

Ichetucknee Springs

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Nevada, Nevada National Parks

Ichthyosaur Site

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Idaho, Idaho National Parks, Montana, Montana National Parks

Idaho Panhandle National Forests

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Idaho, Idaho National Parks, Montana, Montana National Parks, Oregon, Oregon National Parks, Washington, Washington National Parks

Ice Age Floods National Geologic Trail

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Wisconsin, Wisconsin National Parks

Ice Age National Scenic Trail

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West Virginia, West Virginia National Parks

Ice Mountain

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Hawaii, Hawaii National Parks

ʻĪao Valley