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A perennial favorite
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This one requires some explaining.
When I was in the third or fourth grade as a class we read a book called
The White Mountains the one on the left.
The storyline is several hundred years after our time Earth has been invaded and overtaken by a race of aliens.
The aliens are never seen or described in the book.
The aliens are represented by tripod walkers and it's never made clear in the first book whether the tripods are the aliens or are the alien's vehicles.
The aliens practice mind control on all human beings the age isn't made clear in the book but it's basically once they hit early puberty say 13 to 15 years old.
I live in a wind farm. I can't walk out my house and look in any direction and not see a turbine.
The turbines reminded me of these books. So I bought the set on eBay and I'm working my way through it.
Even after 50 years the books are surprisingly well written . Even though they're written out of fourth or maybe 5th grade level. They were written when fourth or fifth graders were expected to be better educated than they are today.