Wikipedia - Poison Ivy - Toxicodendron radicans
Wikipedia - Poison Ivy - Toxicodendron rydbergii
Wikipedia - Atlantic Poison Oak
Wikipedia - Western Poison Oak
Youtube video - herbalist Jim Mcdonald looks at Poison Ivy
Poison Ivy Oak and Sumac Information Center
Some Books About Poison Ivy
In Praise of Poison Ivy - Anita Sanchez - 2016 - 298 pages
http://www.amazon.com/dp/1630761311/
The Poison Ivy, Oak and Sumac Book - Thomas E. Anderson - 1995 - 130 pages
http://www.amazon.com/dp/0963937189/
Revised 04/26/22, 06/26/06.
Checked links 04/26/22.