Universitätsbibliothek Augsburg: Iter exstaticum.
Michael John Gorman and
Nick Wilding: (website hosted by
Institute and Museum of the History of Science, (Museo Galileo), Florence:
!
Athanasius Kircher Correspondence Project.
Excellent!
Athanasius Kircher: Iter exstaticum secundum qui et mundi subterranei prodromus dicitur. Google eBook, PDF download here.
W.C. Parcell (2009): Signs and symbols in Kircher´s Mundus Subterraneus. In PDF, Geological Society of America Memoirs.
History of Science, Stanford University:
Athanasius Kircher at Stanford.
This site is home to the many and varied Athanasius Kircher
collections and research activities at Stanford University.
Go to:
Iter
Exstaticum.
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Picture from Mundus subterraneus