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Amazon has the Kindle edition of Silverwings by Robert Silverberg for $ 1.99. This seminal piece of science fiction is recommended for all fans of the genre

https://www.amazon.com/dp/B00CHW661Q

Winner of the Hugo Award: This classic is an "evocative look at a crumbling Earth of the far future and a human race struggling to survive" (George R. R. Martin).

"Roum is a city built on seven hills. They say it was a capital of man in one of the earlier cycles. I knew nothing of that, for my guild was Watching, not Remembering."