The Divided Legacy by Harry S. Coulter
One of my all time favorites for new or prospective students and a must read for any ND!
The Clan of the Cave Bear (Earth’s children series) by Jean Auel.
What is fascinating about these books is that all of the herbal medicines throughout the series are used correctly, from an ethnobotanical perspective.
People of the Wolf or anything by W. Michael Gear and Kathleen O’Neal Gear.
Again, these books are fiction, based on archaeological study of ancient civilizations, but all of their herbal medicines are used correctly for each region of the world in which these stories are set.