Astrln cestovn – Techniky a cvien pro opoutn hmotnho tla Goldberg Bruce (2011)

This Czech-language book presents techniques and exercises for mastering interdimensional travel, freeing yourself from the limitations of the earthly plane and the laws of space and time. More than 65 exercises teach you to leave your physical body safely and return safely from exploratory journeys to the upper astral plane, as well as the causal, mental and etheric realms. You can even venture onto the spiritual plane and observe the development of your cosmic future.