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The most drastic changes of the Columbia River took place at the end of the last Ice Age when the Missoula Floods cut the steep, dramatic walls that exist today, flooding the river as high up as Crown Point. This quick erosion left many layers of volcanic rock exposed.

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8×10, 8.5×11, 8×12, 10×10, 10×15, 11×14, 12×36, 16×20, 20×20, 24×36

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Paper, Matboard, Canvas, Metal

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