Herbert van Erkelens, Modern Alchemy. Number Archetypes, the Feminine and the Mayan Calendar. Todtmoos-Rütte: Johanna Nordländer Verlag, 2007. See: Johanna Nordländer Publishing .

This book describes:

• Number archetypes as levels of consciousness
• The return of the Great Goddess in our time
• The link between Jungian psychology and Mayan cosmology
• The alchemy of crop circles