Classic Texts
Links
Culbreth's Materia Medica (1927)
http://www.swsbm.com/ManualsOther/Culbreth.html
Abridged version of the original manual, downloadable in Adobe Acrobat (pdf) format. 443 pages, including over 300 illustrations of medicinal plants.
Henriette's Herbal: Classic Herbal Texts
http://ibiblio.org/herbmed/eclectic/main.html
Large collection in html format.