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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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Ca - atomic numbers 1-20
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Ce - atomic numbers 21-40
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Ci - atomic numbers 41-56
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Co - lanthanides
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Cu - atomic numbers 72-88
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Cy - actinides
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Cyb - actinium and compounds
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Cyba - actinium
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Cyc - thorium and compounds
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Cyca - thorium
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Cyd - protactinium and compounds
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Cyda - protactinium
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Cyf - uranium and compounds
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Cyfa - uranium
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Cyfe - uranium oxides
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Cyfed - uranium dioxide
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Cyfem - uranium oxide
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Cyg - transuranium elements
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Cyh - neptunium and compounds
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Cyha - neptunium
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Cyj - plutonium and compounds
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Cyja - plutonium
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Cyje - plutonium oxide
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Cyk - transplutonium elements
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Cyl - americium and compounds
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Cyla - americium
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Cylab - americium-241
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Cym - curium and compounds
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Cyma - curium
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Cyn - berkelium and compounds
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Cyna - berkelium
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Cyp - californium and compounds
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Cypa - californium
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Cyq - einsteinium and compounds
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Cyqa - einsteinium
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Cyr - fermium and compounds
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Cyra - fermium
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Cys - mendelevium and compounds
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Cysa - mendelevium
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Cyt - nobelium
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Cyw - lawrencium
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Cz - inorganic compound classes
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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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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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2 - America
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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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