U.S. Geological Survey Publications WarehouseU.S. Geol.. Survey Prof. Paper 489, 109 p. see...
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U.S. Geological Survey Publications WarehouseU.S. Geol.. Survey Prof. Paper 489, 109 p. see reference 2 above) modified by see reference 2 above) modif i ed by F. K - SLATE ÃORMHr/0/1