TREE PROTECTION ORDINANCE

http://www.fs.fed.us/ucf/treesforpeople.html "Trees for People 
Urban Forestry 101" this is a excellent one page handout that can be printed as a PDF that is very informative on the value of retaing urban trees.

http://www.mnstac.org/RFC/preservationordguide.htm - an 8 page brief introduction entitled "A Guide to Developing a Community Tree Preservation Ordinance"

http://www.fs.fed.us/ucf/ the linkk to the US Forest Service website entitled "Urban and Community Forestry"

http://www.conservationtools.org/tools/general/show/37 "Tree Ordinance" a 7 page brief discussion that has an excellent starting list of basic topics and special topics that should be in any tree 
ordinance.

http://www.isa-arbor.com/publications/ordinance.aspx the most comprehensive and lengthy , even though from 2001, is the "Guidelines for Developing and Evaluating Trees Ordinances" done by 
the International Society for Arborculture

http://www.urbanforestrysouth.org/resources/library/urban-tree-conservation-a-white-paper-on-local-ordinance-approaches/ You can print out a copy from here of an excellent paper on protecting trees on private property entitled : Urban Tree Conservation: A White Paper on Local Ordinance Approaches.

http://www.gfc.state.ga.us/communityforests/documents/2005TreeOrdinance-100.pdf "Tree Ordinance Development Guidebook" 32 pages with a checklist of items for a tree ordinance - not a complete list but again gives ideas.

http://www.dnr.wa.gov/Publications/rp_urban_guideucfprograms.pdf a 2009 report entitled "A Guide to Community and Urban Forestry Programming" done by the Washington State Department of Commerce and the Evergreen Communities Partnership Task Force.

Two important Seattle Background papers we need to keep in mind:

http://www.cityofseattle.net/audit/docs/PublishedReport20090515.pdf "Management of City Trees Can be Improved" 2009 by the office of City Auditor - Seattle

http://www.seattle.gov/environment/documents/Final_UFMP.pdf the 2007 City of Seattle "Urban Forest Management Plan"