1973. 2012-11-07T14:15:37Z. 2012-11-07T14:15:37Z. Pierce, Kenneth Lee. Dept. of the Interior, U.S. Geological Survey. English. Public. Yellowstone National Park.
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1973. 2012-11-06T20:29:39Z. 2012-11-06T20:29:39Z. Pierce, Kenneth Lee. Dept. of the Interior, U.S. Geological Survey. English. Public. Yellowstone National Park.