A Brief Arbor Day History: Features timetable of the holiday's development. From Ohio Division of Forestry.
Arbor Day: The history of Arbor Day with information about international "tree" celebrations. Find out when each U.S. state celebrates Arbor Day.
Arbor Day - Day of Trees: Tells about Arbor Day in Australia.
Celebrate! Holidays In The U.S.A. - Arbor Day: A short history of the holiday.