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630*26 --- 631.452 --- 631.46 --- 631.417 --- 631.417 Organic chemistry of soil --- Organic chemistry of soil --- 631.46 Soil bacteriology. Soil biology --- Soil bacteriology. Soil biology --- 631.452 Soil fertility --- Soil fertility --- 630*26 Combinations of forestry with agriculture and pastoral husbandry. Irrigated and floodland forests. Shelterbelts etc. and their treatment. Agroforestry --- Combinations of forestry with agriculture and pastoral husbandry. Irrigated and floodland forests. Shelterbelts etc. and their treatment. Agroforestry --- Agroforestry --- Soils --- Fallowing --- Fertilizers --- Soil productivity --- Agro-forestry --- Agriculture --- Forests and forestry --- Tree crops --- Research --- Fertilization --- Fertilizer movement

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Electromagnetism --- -Electromagnetics --- Magnetic induction --- Magnetism --- Metamaterials --- Physiological effect --- Physiological effect. --- Electromagnetic fields --- Electromagnetic waves