div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: SILICA DUST IN AN COAL Piedrahíta H Vanegas E González icohconfexcomicoh2012webprogramHandoutid199FP582_A1563pdfhugopiedrahita@cerrejoncom A study was carried src=https:reader034vdocumentsmxreader034viewer20220503035f6c0a359a681937e97285a3html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv