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Shaded relief map of the United States (minus Alaska and Hawaii) showing the Western mountains (e.g., Sierra Nevada, Cascades, Rockies), the central plains, and the Appalachian Mountains in the East.
Science VU/USGS/Visuals Unlimited, Inc.
all images © Visuals Unlimited
Visuals Unlimited, Inc. specializes in, microscopy, healthcare, medical, wildlife, underwater, agriculture, and science stock photography.