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- Geographic Subject: Indiana76
- Topical Subject: SYMAP (Computer program language)18
- Topical Subject: Labor supply16
- Topical Subject: Historical geography6
- Topical Subject: Population geography6
- Topical Subject: Population4
- Topical Subject: Administrative and political divisions3
- Topical Subject: Agricultural resources3
- Topical Subject: Cities and towns3
- Topical Subject: City dwellers3
- Topical Subject: Counties3
- Topical Subject: Outdoor recreation3
- Topical Subject: Physical geography3
- Topical Subject: Phytogeography3
- Topical Subject: Atmospheric temperature2
- Topical Subject: Electric railroads2
- Topical Subject: Farms2
- Topical Subject: Forest reserves2
- Topical Subject: Geology2
- Topical Subject: Glacial landforms2