PELs, RELs and TLVs still cause problems

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      <subfield code="a">PELs, RELs and TLVs still cause problems</subfield>
      <subfield code="c">by Jim Castelli</subfield>
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      <subfield code="a">OSHA's request for conformance to permissible exposure limits intensifies an already heated controversy. This article contains: debate may intensify; mixed reactions to PELs; standards differ; difference not great; new PELs to come; legal considerations; funding sources scarce</subfield>
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      <subfield code="g">Vol. 143, nº 4, April 1991 ; p. 38-41</subfield>
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