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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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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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Qa - measurement of physical agents
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Qd - image analysis
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Qe - sampling and analysis
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Qi - determination of concentration
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Qk - mineralogy
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Qm - materials testing
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Qo - biological and medical tests
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Qr - applied research
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Qra - hazard evaluation
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Qrae - exposure evaluation
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Qraen - noise dosimetry
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Qraev - vibration dosimetry
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Qras - stress evaluation
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Qrat - toxicity evaluation
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Qrc - climate chamber studies
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Qre - experimental determination
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Qrea - animal experiments
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Qreac - inhalation chambers
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Qread - effective dose 50
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Qreaf - lethal dose 50
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Qreal - lethal concentration 50
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Qream - lethal time 50
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Qrear - control substances
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Qreax - exposure chambers
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Qreaz - extrapolation animal man
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Qreb - human experiments
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Qreba - subjective assessment
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Qrec - comparative study
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Qred - long-term study
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Qref - field tests
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Qrei - in vitro experiments
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Qreim - in vitro organ maintenance
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Qreis - electric stimulation of tissues
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Qrej - teratogenicity tests
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Qrek - carcinogenicity tests
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Qreka - mutagenicity tests
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Qrel - determination of exposure limits
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Qrem - tests on models
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Qrep - experimental mine research
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Qrepa - gallery tests
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Qreq - evaluation of equipment
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Qreqa - accuracy
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Qres - simulation facilities
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Qrf - fire research
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Qrfe - extinguishment tests
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Qrfl - flammability testing
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Qrfla - determination of flashpoints
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Qrflac - closed cup method
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Qrfli - determination of flammable limits
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Qrfr - fire resistance testing
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Qri - explosion research
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Qrie - explosibility testing
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Qriec - explosion chambers
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Qril - determination of explosive limits
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Qrs - survey
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Qrsh - occupational health survey
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Qrso - questionnaire survey
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Qrsp - epidemiologic study
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Qrspa - case-control study
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Qrspc - confounding factors
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Qrsph - healthy worker effect
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Qrspo - cohort study
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Qrspr - cross-sectional study
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Qrspu - unhealthy worker effect
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Qrt - evaluation of technique
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Qrtp - programme evaluation
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Qru - accident research
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Qrua - analysis of accident causes
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Qruac - critical incident technique
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Qrub - accident black spots
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Qrud - accident-design relationship
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Qrum - evaluation of control measures
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Qrumc - comfort assessment
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Qrup - evaluation of safety propaganda
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Qry - theoretical analysis
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Qu - investigation in human sciences
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Qw - work study
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Qy - mathematical analysis
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Qz - units of measurement
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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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