Classic texts: Scudder's Materia Medica, 1898: Alteratives.
Archives: Best of the Herbal Forums: 03.2003.
Archives: Best of the Herbal Forums: 02.2003.
Henriette's herbal blog: The first in a series on yellow-flowering herbs.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.
Plant Healer Magazine: Very relevant to the practitioner.
http://www.henriettes-herb.com - Copyright 1995–2015 Henriette Kress.