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Publication Extents

Not all publications have extents, not all extents are completely accurate
The Glaciation of the Yellowstone Valley North of the Park
Walter Harvey Weed
1893, Bulletin 104
The local glaciers of Quaternary times, of which evidences abound throughout the highest portions of the Rocky mountain cordillera, attained an unusually extensive development in that broad elevated region known as the Yellowstone Park. It was indeed the center of a considerable ice sheet whose glaciers spread out and down...