Thresold limit values for chemical substances in workroom air

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      <subfield code="a">Thresold limit values refer to airborne concentrations of substances and represent conditions under which it is believed that nearly all workers may be repeatedly exposed without adverse effect. The guides that gradually have become the most widely accepted are those issued by the American Conference of Governmental Industrial Hygienists, and termed Thresold limit values (TLVs)</subfield>
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      <subfield code="g">Vol. 119, nº 1, January 1979 ; p. 65-73</subfield>
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