01384nam 2200409 a 450 991070058030332120111230095524.0(CKB)5470000002410191(OCoLC)769816182(OCoLC)1285604481(EXLCZ)99547000000241019120111230d2011 ua 0engurcn|||||||||txtrdacontentcrdamediacrrdacarrierTrenching and excavation safety[electronic resource][Washington, D.C.] :U.S. Dept. of Labor, Occupational Safety and Health Administration,[2011]1 online resource (2 unnumbered pages)OSHA factsheetTitle from title screen (viewed on Dec. 30, 2011)."DOC FS-3476 9/2011."Includes bibliographical references.ExcavationSafety measuresTrenching machinerySafety measuresIndustrial safetyUnited StatesExcavationSafety measures.Trenching machinerySafety measures.Industrial safetyUnited States.Occupational Safety and Health Administration.GPOGPOBOOK9910700580303321Trenching and excavation safety3106868UNINA