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Subjects
- Agriculture -- United States.1
- Archaeology.1
- Conservation of natural resources -- United States.1
- Diplomats.1
- Forestry.1
- Forests and forestry -- United States.1
- Forests.1
- International relations.1
- Lumber industry.1
- Mounds (Burials) -- Wisconsin.1
- Mounds -- Wisconsin.1
- Roads -- Design and construction.1
- Roads -- Mexico.1