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- Geologists13
- Geology✖[remove]13
- History11
- Lyell, Charles, Sir, 1797-18754
- Darwin, Charles, 1809-18823
- Biography2
- Influence2
- Smith, William, 1769-18392
- Alexander, Elizabeth, 1908-19581
- American1
- Astronomers1
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- Geological Society of London1
- Geology, Stratigraphic1
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- Radio astronomy1
- Reeve, William H., 1906-1
- Research1