Transylvanian Moonrise: A Secret Initiation in the Mysterious Land of the Gods by Radu Cinamar & Peter Moon (2011)
(Transylvanian Series #2)

Mystery of Egypt: The First Tunnel by Radu Cinamar & Peter Moon (2012)
(Transylvanian Series #3)

The Secret Parchment: Five Tibetan Initiation Techniques by Radu Cinamar & Peter Moon (2013)
(Transylvanian Series #4)

Inside the Earth: The Second Tunnel by Radu Cinamar (2019)
(Transylvanian Series #5)

Forgotten Genesis by Radu Cinamar (2020)
(Transylvanian Series #6)

The Etheric Crystal: The Third Tunnel by Radu Cinamar (2020)
(Transylvanian Series #7)

something I picked up along my spiritual path ....this pdf talks about this subject in detail ... enjoy