Subject
- Topical Subject: Population density2
- Topical Subject: Railroads2
- Geographic Subject: Hoosier National Forest (Ind.)1
- Geographic Subject: Lincoln Hills Resource Conservation and Development Project Area (Ind.)1
- Topical Subject: Air travel1
- Topical Subject: Airways1
- Topical Subject: Business enterprises--Employees1
- Topical Subject: Cattle--Geographical distribution1
- Topical Subject: Ceramic industries1
- Topical Subject: Chemical workers1
- Topical Subject: Coal mines and mining1
- Topical Subject: Corn--Geographical distribution1
- Topical Subject: Drainage1
- Topical Subject: Drift1
- Topical Subject: Education, higher1
- Topical Subject: Electric machinery industry--Employees1
- Topical Subject: Express highways1
- Topical Subject: Farm produce1
- Topical Subject: Farms1
- Topical Subject: Food industry and trade--Employees1