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Goodreads asked Andy McGee:

Where did you get the idea for your most recent book?

Andy McGee Working as a geophysicist in India. Intrigued by how much subsurface mapping told me about ancient events. New Scientist introduced me to Andrew Robinson and his well-written treatise on the Harappans, titled The Indus Lost Civilisations.
The rest is imagination. Following it up with a scifi version of the world in 100 years.

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