“I… asked JMG this exact question at that time, “Where did the elemental association for the Ogham come from in the Druid Magic Handbook?” His answer was simple: that was what spirit gave him.”
Aha–so I won’t find this system in any other book. That’s helpful to know. Thanks for the info. At some point I will do a comparison of his system with the booklet I got from OBOD (if I don’t purchase other books on Ogham… I have a lot of books to read!).