Resources
International Society of Arboriculture: ISA
The ISA has great information and helpful tips on managing proper tree health care. Check them out at: http://www.isa-arbor.com/
Tree Care Industry Association: TCIA
Check them out at: http://www.tcia.org/
California Contractors State License Board: CSLB
Check them out at: http://www.cslb.ca.gov/
American National Standards Institute: ANSI
Check them out at: https://www.ansi.org/