This portal features an alphabetical listing of links to standard and three-dimensional (3D) images of geological and natural history-related subjects in the National Parks of the United States. The 3D images are anaglyphs and require red and cyan 3D viewing glasses. These full-size images may be slow to download. Users can click on a national park to start an image tour, use a subject index, location map, or thumbnail gallery index. At each index additional choices of how the photographs are pr
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