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Subject
- Discovery and exploration394
- Exploration169
- Exploring expeditions162
- Description and travel146
- History136
- Spanish69
- Indians of North America49
- Columbus, Christopher43
- Planets41
- Norse32
- Geology26
- Explorers20
- La Salle, Robert Cavelier, sieur de, 1643-168720
- Explorations and surveys19
- Space vehicles17
- Pacific railroads15
- Astronautics14
- Voyages and travels14
- Colonies13
- English13