"Liber Mundi" is not a single canonical work but a phrase used for multiple texts across periods:
: Provides deep dives into alchemy, Qabalah, astrology, mythology, and religion. Guide to "Book M" Resources Resource Type Description Link / Source Official Guidebook book m liber mundi pdf
The title refers to a legendary text from Rosicrucian history: "Liber Mundi" is not a single canonical work