[Rev.]; "Revised 8/09"--P.  of cover.; "This edition of A guide to the OSHA excavation standard has been updated to include material as prepared by the Construction Education and Research Institute, Department of Civil Engineering at N.C. State...
[Rev.].; "A guide to CAL/OSHA (California, June 1985) and Facts about occupational safety and health (Kentucky, February 1985) provided ideas and a framework for this guide"--P.  of cover.; "Revised 9/09"--P.  of cover.; Includes...
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