Tree and Treehouse Link Resources

Arborist & Tree Care Resources
International Society of Arboriculture (ISA) - Jonathan is an ISA Certified Arborist and strives to care for trees as he builds his treehouses.
Morris Arboretum - For an amazing arboreal experience, try walking through this world class garden near Jonathan Fairoak's east coast office in Pennsylvania.
Muir Woods - Want to walk among the monster redwood trees? Muir Woods, a tree lover's monument, is near Jonathan's west coast office in California.

Treehouse Related Resources
Treehouse Books - Jonathan Fairoaks recommends the books at the end of this link for anyone looking for general treehouse ideas & information.
The Treehouse Guide - Jonathan Fairoaks and his treehouse building company are listed on Patrick Fulton's world known, but mostly european based website.