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Subclass S
| S1-(972) | Agriculture (General) | ||
| S21-400.5 | Documents and other collections | ||
| S403 | Agricultural missions, voyages, etc. | ||
| S419-482 | History | ||
| S530-559 | Agricultural education | ||
| S539.5-542.3 | Research. Experimentation | ||
| S544-545.53 | Agricultural extension work | ||
| S548-548.6 | Historic farms | ||
| S550-559 | Exhibitions. Fairs | ||
| S560-571.5 | Farm economics. Farm management. Agricultural mathematics Including production standards, record keeping, farmwork rates, marketing | ||
| S583-587.73 | Agricultural chemistry. Agricultural chemicals | ||
| S588.4-589.6 | Agricultural physics Including radioisotopes in agriculture | ||
| S589.7 | Agricultural ecology (General) | ||
| S589.75-589.76 | Agriculture and the environment | ||
| S589.8-589.87 | Plant growing media. Potting soils | ||
| S590-599.9 | Soils. Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships | ||
| S600-600.7 | Agricultural meteorology. Crops and climate | ||
| S602.5-604.37 | Methods and systems of culture. Cropping systems Including fallowing, rotation of crops, plowing | ||
| S604.5-604.64 | Agricultural conservation | ||
| S604.8-621.5 | Melioration: Improvement, reclamation, fertilization, irrigation, etc., of lands | ||
| S605.5 | Organic farming. Organiculture | ||
| S606-621.5 | Special classes of lands and reclamation methods Including woodlands, burning of lands, deserts, saline environments, moors | ||
| S622-627 | Soil conservation and protection | ||
| S631-667 | Fertilizers and improvement of the soil | ||
| S671-760.5 | Farm machinery and farm engineering | ||
| S770-790.3 | Agricultural structures. Farm buildings | ||
| S900-(972) | Conservation of natural resources Including land conservation | ||
