Subject Topical
- Coal--Transportation31
- Petroleum industry and trade--United States31
- Social Security29
- Air travel27
- Elections27
- Black Lung Trust Fund26
- Local transit26
- Tourism26
- Transportation26
- Acid rain25
- Employment25
- Historic preservation24
- Water treatment plants24
- Wild and scenic rivers24
- Budget23
- Coal mines and mining--Safety regulations23
- Airports22
- Strip mining22
- Older people20
- Rivers20