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19th Century North American Geological Surveys
19th Century North American Geological Surveys
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Palliser Expedition geological investigations in Western Canada (1857–1860)
1857 - 1865
13 entries
John Wesley Powell's Colorado River and Grand Canyon Surveys (1869–1879)
1867 - 1879
12 entries
Hayden Geological and Geographical Surveys of the Territories (F. V. Hayden) (1867–1878)
1867 - 1879
12 entries
Clarence King's Geological Exploration of the Fortieth Parallel (1867–1872)
1867 - 1879
14 entries