Arbor Day - Day of Trees
- Tells about Arbor Day in Australia.
- http://www.naturebase.net/content/view/909/1283/

A Brief Arbor Day History
- Features timetable of the holiday's development. From Ohio Division of Forestry.
- http://www.dnr.ohio.gov/forestry/education/arbordayhistory.htm

Celebrate! Holidays In The U.S.A. - Arbor Day
- A short history of the holiday.
- http://stockholm.usembassy.gov/Holidays/celebrate/arborday.html

Arbor Day
- The history of Arbor Day with information about international "tree" celebrations. Find out when each U.S. state celebrates Arbor Day.
- http://www.arbor-day.net/