| LC Classification | Subject | Level |
|---|---|---|
| HC 79 | Environmental economics – special topics | 3B |
| HD 75.6 | Economic development -- Environmental aspects / Sustainable development | 4 |
| HD 111 | Land use | 4 |
| HD 1401-4814 | Agricultural Economics | 4 |
| HD 9000-9195 | Agricultural industries | 4 |
| S 492 | Agriculture – Africa – economic aspects | 3B |
Key to the Levels:
1. Minimal Level
2. Basic Information Level
3. Study or Instructional Support Level
3a. Study or Instructional Support Level, Introductory
3b. Study or Instructional Support Level, Advanced
4. Research Level
5. Comprehensive Level