December 2011
US Centers for Disease Control and Prevention (CDC) smoking prevalence report: http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6038a2.htm?s_cid=mm6038a2_w
Trenching and Excavation Safety fact sheet: http://www.osha.gov/OshDoc/data_Hurricane_Facts/trench_excavation_fs.pdf
Working safely in trenches quick card: http://www.osha.gov/Publications/trench/trench_safety_tips_card.pdf
Do not enter an unprotected trench poster: http://www.osha.gov/Publications/trench/3215_trench_poster_eng.pdf
Workplace violence: http://www.osha.gov/SLTC/workplaceviolence/
