| ลำดับที่ | LC |
คำอธิบาย |
| 1 |
|
Agriculture (General) |
| 2 |
|
Documents and other collections |
| 3 |
|
Agricultural missions, voyages, etc. |
| 4 |
|
History |
| 5 |
|
Agricultural education |
| 6 |
|
Research. Experimentation |
| 7 |
|
Agricultural extension work |
| 8 |
|
Historic farms |
| 9 |
|
Exhibitions. Fairs |
| 10 |
|
Farm economics. Farm management. Agricultural mathematics Including production standards, record keeping, farmwork rates, marketing |
| 11 |
|
Agricultural chemistry. Agricultural chemicals |
| 12 |
|
Agricultural physics Including radioisotopes in agriculture |
| 13 |
|
Agricultural ecology (General) |
| 14 |
|
Agriculture and the environment |
| 15 |
|
Plant growing media. Potting soils |
| 16 |
|
Soils. Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships |
| 17 |
|
Agricultural meteorology. Crops and climate |
| 18 |
|
Methods and systems of culture. Cropping systems Including fallowing, rotation of crops, plowing |
| 19 |
|
Agricultural conservation |
| 20 |
|
Melioration: Improvement, reclamation, fertilization, irrigation, etc., of lands |
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