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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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Dh - ketones
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Di - carboxylic acids
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Dj - esters and salts
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Dk - organic peroxides
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Dl - cyano compounds
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Dm - organometallic compounds
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Dn - nitro compounds
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Do - amines
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Dp - azo and related compounds
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Dq - oximes
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Dr - amides
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Ds - onium compounds
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Dsa - quaternary ammonium compounds
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Dsab - benzalkonium chloride
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Dsabc - dichlorobenzalkonium chloride
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Dsabe - benzethonium chloride
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Dsac - dioctadecyl dimethyl ammonium chloride
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Dsad - decamethonium
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Dsae - carbachol
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Dsal - ditallow dimethyl ammonium chloride
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Dsam - methacholine
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Dsamc - chlormequat chloride
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Dsap - denatonium benzoate
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Dsaq - QUAB 188
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Dsat - trimethylphenylammonium chloride
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Dse - phosphonium compounds
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Dsea - tetrahydroxymethylphosphonium acetate/phosphate
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Dsec - tetrakis(hydroxymethyl)phosphonium chloride
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Dseh - tetrakis(hydroxymethyl)phosphonium hydroxide
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Dses - tetrakis(hydroxymethyl)phosphonium sulfate
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Dsi - arsonium compounds
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Dso - stibonium compounds
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Dsu - sulfonium compounds
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Dt - organosulfur compounds
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Du - heterocyclic compounds
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Dv - polymers
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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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1 - Africa
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2 - America
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3 - Asia
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4 - Europe
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5 - Oceania
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6 - geographical areas
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7 - international governmental organizations (non UN)
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8 - UN organizations
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9 - international non-governmental organizations
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