Green Belt Consulting
http://www.greenbeltconsulting.com/

Trees Are Good
http://www.treesaregood.com/

Why Hire An Arborist
http://www.treesaregood.com/treeowner/whyhireanarborist.aspx

Benefits of Arborist Mulch
https://puyallup.wsu.edu/wp-content/uploads/sites/403/2015/03/wood-chips.pdf

‘Windsail Reduction’ — a Northwest Controversy December 6, 2012
http://dnrtreelink.wordpress.com/2012/12/06/windsail-reduction-a-northwest-controversy/

A great video on roots and mycorrhizal relationships
http://vimeo.com/83697133

Tree Dictionary (with many good links)
http://www.treedictionary.com/