Arboriculture Organizations:
International Society of Arboriculture

Western Chapter ISA

Canopy: Trees for Palo Alto

California Oak Foundation

General Tree Information:
Trees Are Good

Wikipedia: Trees 

Planting Trees

Urban Tree Foundation

How to Prune Trees:

Tree Identification Guide

SelecTree Tree Selection Guide

Diseases and Pests:
Sudden Oak Death

Pine Pitch Canker

Oak Root Fungus

Phytophthora Root Rot

Monterey Cypress Canker

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