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Index map showing locations of 1967–1968 research drill holes in Yellowstone National Park

By Yellowstone Volcano Observatory 1975 (approx.)
Index map showing locations of 1967–1968 research drill holes in Yellowstone National Park
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Detailed Description

Map: Index map showing locations of 1967–1968 research drill holes in Yellowstone National Park. Taken from USGS Bulletin 1967.

Sources/Usage

Public Domain.