Arbor Quest: Introductory Instruction & summer camps for disabled kids; MI

http://www.arborquest.org/

Archangel Ancient Tree Archive: Champion Tree Propagation & Environmental Education; MI

www.ancienttreearchive.org/

Blue Ridge Tree Climbing: Introductory & Advanced Instruction; Meadows of Dan, VA

www.blueridgetreeclimbing.com/

Canopy Climbers: Introductory & Advanced Instruction; Gainesville, FL

www.canopyclimbers.com/

EarthJoy: Introductory & Advanced Instruction; OH/n.KY

www.climbtreeswithearthjoy.com/

Global Organization of Tree Climbers: Resources for Recreational Climbers

http://www.gotreeclimbing.org/

Good Leaf Tree Climbing: Introductory & Advanced Instruction; Isle of Wight, GB

www.goodleaf.co.uk/

Knot Tying: Animated knots useful for tree climbers...select ‘Arborist’ on home page.

www.animatedknots.com/

New Leaf Tree Climbing: Introductory & Advanced Instruction, nr. Yuba City, CA & Costa Rica

http://www.newleaftreeclimbing.com/

New Tribe: Recreational Saddles & Gear; Grants Pass, OR

www.newtribe.com/

Pathfinders: Introductory & Experiential Educators; St. Petersburg, FL

http://www.pathfinder-ed.org/

Sherrill Tree: Gear Vendor; Greensboro, NC

www.sherrilltree.com/

Tree Climbers International: Originator of Rec Tree Climbing, Advanced Instruction; Atlanta, GA

www.treeclimbing.com/

Tree Climbing Colorado: Introductory & Advanced Instruction; Evergreen, CO

www.treeclimbingcolorado.com/

Tree Climbing Japan: Introductory, serving disabled kids & Advanced Instruction; JAPAN

www.treeclimbing.jp/

Tree Climbing Kansas City: Introductory & Advanced Instruction; Kansas City, MO www.treeclimbingkansascity.com/

Tree Climbing Planet: Introductory & Advanced Instruction; Oregon City, OR & Amazon

www.treeclimbingplanet.com/

Tree Stuff: Gear Vendor; Indianapolis, IN

https://www.treestuff.com/

WesSpur: Gear Vendor; Bellingham, WA

www.wesspur.com/