- Henriette's Herbal: Classic Herbal Texts - Large collection in html format. { herbs | materia medica | classic texts }
- An Illustrated Herbal - An illustrated herbal based mostly on Culpeper's Herbal. It contains around 500 entries of medicinal plants and their properties. Glossary of terms, preparation methods, bolean search engine. { herbs | materia medica | classic texts }
- Culbreth's Materia Medica (1927) - Abridged version of the original manual, including illustrations, can be downloaded as a series of PDF files. { herbs | materia medica | classic texts }