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Check NASA Contract 953653 NAS7-100
Check the appendix of that doc, Targ did lots of foundational work there.
Also read Barbara Brennan's Core Light Healing Chapter 8
The activity mostly occurs on astral/other non physical layers, telepathy is needed to work it effectively
Some telepathy occurs via throat chakra, others by integrating crown and third eye, others still by going above the head, the further up you reach the deeper you need to ground into the earth