Subjects
- Maps.2
- Medicine1
- New Deal, 1933-19391
- Occupational safety and health - Vinyl chloride.1
- Otter Creek Wilderness (W. Va.)1
- Petroleum industry and trade1
- Physicians - letters and papers.1
- Politics and government.1
- Public health1
- Railroad workers.1
- Railroads1
- Rivers and river valleys.1
- Schools1
- Southern Soil Conservation District.1
- Strip mining1