Astral Projection by Oliver Fox. It was written in the early 1900's and even though everything isn't up-to-date in view of terminology the book is an excellent read! Well worth the $1.00 its selling for on amazon.com [
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Also Soul travel by Albert Taylor is interesting. its not very long but he gives some interesting experiences
]Also Soul travel by Albert Taylor is interesting. its not very long but he gives some interesting experiences