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Humble Bundle is a website that "bundles" together sets of games and e-books and sells them for charity. You pay what you want (although it is less so than it used to be) and as you pay more you get more books. I just got an email that they currently have an Astronomy e-book bundle with books from Morgan & Claypool Publishers raising money for the Science Fiction & Fantasy Writers of America:
https://www.humblebu...er=universalsci
More astrophysics than observational astronomy but some interesting books there.
