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Subject
- Geologists[remove]106
- History18
- Geology13
- King, Clarence, 1842-19019
- Description and travel7
- Discovery and exploration7
- Explorers6
- Educators5
- Geological surveys5
- Gilbert, Grove Karl, 1843-19185
- LeConte, Joseph, 1823-19015
- Maclure, William, 1763-18405
- Biography4
- Educational change4
- Hayden, F. V. (Ferdinand Vandeveer), 1829-18874
- Social conditions4
- Social reformers4
- Travel4
- Utopias4
- Evolution3