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338.43 <675> --- 632.95 --- 631.8 --- 661.15 --- Plant and Crop Sciences. Crop Sciences -- Crop Husbandry -- Fertilizers, Fertilizer Application --- Landbouweconomie--Zaïre. Belgisch Kongo. --- Plant protection preparations. Pesticides. --- Fertilizers, manures and soil enrichment. Promotion of growth. Plant stimulants. --- Agricultural chemicals. Fertilizers.