The Charts of Clarence Larkin, Underworld Engineer

The Charts of Clarence Larkin A mechanical engineer by training, Clarence Larkin later found his true calling as a pastor and an author of influential books on religion. He is best remembered, however, for his detailed charts on topics such as: The Underworld, The Failure of Man, The Threefold Nature of Man, and an incredibly detailed The Book of Revelations from his book on Revelations.

Underworld Engineer (via Mefi)
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