http://www.lni.wa.gov/Safety/Topics/AtoZ/CustodialHousekeepingJanitorial/training.asp
http://www.lni.wa.gov/safety/topics/atoz/topic.asp?KWID=419
http://www.lni.wa.gov/Safety/Topics/AtoZ/Restaurants/default.asp
L&I: Landscaping Work (Lawn Maintenance) http://lni.wa.gov/Safety/Topics/AtoZ/Landscaping/
OSHA: Landscape and Horticultural Services http://www.osha.gov/SLTC/landscaping/hazards.html#lifting