There are several books I've read at least once a decade since my teens, if not a bit more often. They are: The Chrysalids by John Wyndham, Farmer in the Sky

There are several books I've read at least once a decade since my teens, if not a bit more often. They are: The Chrysalids by John Wyndham, Farmer in the Sky by Robert Heinlein, and Dune by Frank Herbert. Just the first book though. I really disliked the rest of the series. Honourable mention must also go to The Tripod Trilogy by John Christopher: The White Mountains, The City of Gold and Lead, and The Pool of Fire. I did read these a few times in my teens but lost track of them. Stumbled across a boxed set not too long ago and read again and they're still just as good. More recent fare that I've read and/or listened on audiobook to at least three times are: The First Fifteen Lives of Harry August by Claire North, and the Bobiverse Series by Dennis E. Taylor which I'm about to start listening to again. Links: https://www.goodreads.com/book/show/826845.The_Chrysalids https://www.goodreads.com/book/show/826845.The_Chrysalids https://www.goodreads.com/book/show/50851.Farmer_in_the_Sky https://www.goodreads.com/book/show/50851.Farmer_in_the_Sky https://www.goodreads.com/book/show/44767458-dune https://www.goodreads.com/book/show/44767458-dune https://www.goodreads.com/series/40878-the-tripods https://www.goodreads.com/series/40878-the-tripods https://www.goodreads.com/book/show/35066358-the-first-fifteen-lives-of-harry-august https://www.goodreads.com/book/show/35066358-the-first-fifte... https://www.goodreads.com/series/192752-bobiverse https://www.goodreads.com/series/192752-bobiverse