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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Pylon Entrance
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Jan 21/81
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Nielsen Library: Dry Creek Lichens
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Glyphs
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Nielsen Library: Tuff Rock Petroglyphs
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Nielsen Library: Tuff Rock Counting Glyphs
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Nielsen Library: Tuff Rock Glyph
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Nielsen Library: Tuff Rock
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Nielsen Library: tif836
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Counting Glyphs
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Nielsen Library: Tuff Rock Petroglyphs
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Nielsen Library: Tuff Rock- Entrance
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Petroglyphs
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Petroglyphs
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Nielsen Library: Tuff Rock Petroglyphs
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock in Largest Core
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Nielsen Library: Pylon Entry to Tuff Rock
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Nielsen Library: Tuff Rock
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Nielsen Library: Tuff Rock Petroglyphs
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Nielsen Library: Pylon Entry, Tuff Rock