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Stephen Baxter, Terry Pratchett: The Long Utopia (The Long Earth Book 4) (2015, Harper)

2045-2059. After the cataclysmic upheavals of Step Day and the Yellowstone eruption humanity is spreading …

Review of 'The Long Utopia (The Long Earth Book 4)' on 'Goodreads'

A very good entry in the Long Earth series, introducing a new transdimensional existential threat, and explaining a bit of the history of Steppers as well.