Mastodonia

A more classic time travel book than [b:The Future of Another Timeline 43263237 The Future of Another Timeline Annalee Newitz https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1550000245l/43263237.SY75.jpg 64154258], which I recently read.The two books can't really be compared except to say they both involve time travel.In Mastadonia, our heroes discover a way to travel into the past. They then decide to make a business of it.They mostly ignore the dangers of changing the past except that they decide to not go into time periods when humans were around.They have interesting conflicts with the government and with religious groups in ways I hadn't seen before.It's a little slow in places but if you like time travel books, I recommend it.