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This is a slim volume, but I cannot think of anything else I would want to be added – this is a useful and concise look at Shamanistic Druidry, and answers a ton of questions about the subject.
A small historical background, a detailed look at tools and useful working practices preface a series of journeying exercises, focusing on finding several guides, including ancestor and site/plane -specific guides.
There is lots of emphasis on safety, which I am glad to see – not wandering off into Otherland without a guide, making sure you converse and question your guide at every opportunity and don’t let them through into your home until you’ve spent plenty of time with them and trust them.
This could be the only book you read on this subject, and you’d be fine and ready to explore on your own, with your guides.