A compendium of the top metaphysical and spiritual authors in 1987 writing on topics that were pioneers in this field. Each article is written by a well known authority, so this is a way to get a look at what was available in the 1980s. Even though there have been many changes since then, these authors were creating something that did not exist prior to their work in this form and along with that, they created a vocabulary still in use today by crystal practitioners of all kinds. If you want to see how it all got started, this is a good book for history alone. ( )