An Improved membrane filter technique for evaluation of asbestos fibers

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      <subfield code="a">An improved technique to prepare asbestos fibers collected on a cellulose-ester filter for phase contrast microscopy is presented. It is Compared with transmission electron microscopy of policarbonate filters. The analyst errors in fiber enumeration were evaluated also</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="g">Vol. 50, nº 3, March 1989 ; p. 174-180</subfield>
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