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A - occupational safety and health
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B - physics, chemistry and natural phenomena
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C - inorganic chemicals
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D - organic compounds
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Da - hydrocarbons
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Dc - minor compound classes
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De - ethers
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Df - acetals
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Dg - aldehydes
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Di - carboxylic acids
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Du - heterocyclic compounds
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Dy - carbohydrates
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Dz - halogenated organic compounds
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E - enzymes
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F - natural products and substances
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G - industrial products
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H - equipment, workplaces and operations
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I - equipment, workplaces and operations (2)
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J - equipment, workplaces and operations (3)
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K - work and industrial organization
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L - fire, explosions
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M - occupational pathology
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N - occupational pathology (cont.)
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P - physiology, anatomy, psychology
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Q - measurement and investigation
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R - medical prevention and treatment
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S - safety and health engineering
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T - personal protective equipment
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V - safety and health organization
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W - groups of persons
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X - industries
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Y - occupational accidents
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Z - generalities
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