Minnesota Digital Library
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Subject Headings
- Architectural Drawing 88
- Letter Writing 58
- United States History Civil War, 1861 1865 55
- Rivers 35
- Housing, Single Family 34
- Architect Designed Houses 31
- Severe Storms 29
- Tornadoes 29
- Dams 22
- Hydroelectric Power Plants 20
- Hospitals 19
- Balloonists 16
- Balloons 16
- Frontier and Pioneer Life 14
- Clinics 13
- Floods 10
- School Buildings 10
- Bridges 9
- Physicians 9
- Church Buildings 8