Tree: Essence of Healing by Simon Lilly and Sue Lilly is an in-depth exploration of how the subtle energies of trees can harmonise the subtle bodies of human beings, and thereby bring about physical, emotional and spritual healing.
Yew: A History by Fred Hageneder presents in depth the botany as well as the cultural history and remarkable mythology of the sacred trees of the genus Taxus.
Psychic development 
