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Geological Survey 7th Annual Report
Obsidian Cliff, Yellowstone National Park |
OBSIDIAN CLIFF, YELLOWSTONE NATIONAL PARK
By
Joseph P. Iddings
extract from
GEOLOGICAL SURVEY 7th ANNUAL REPORT
1888
rpt/7-1/index.htm
Last Updated: 22-Jun-2009
By
extract from GEOLOGICAL SURVEY 7th ANNUAL REPORT 1888 rpt/7-1/index.htm Last Updated: 22-Jun-2009 |