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James Schmitz's books Esp The Witches of Karres and Demon Breed.
All of Andre Norton's both S.F. and Fantasy.
James White Hospital Station books about a multispecies hospital station in space.
Lois Bujold's Vorkosiggan series
Susan Cooper's THe Dark is Rising series.
Mercedes Lackey's Arrows of the Queen and others.
Patricia Mckillip's The Changeling Sea and Riddlemaster.
Robin Mckinley's The Hero and the Crown and The Blue Sword.
Tamora Pierce's series starting with Alanna about a girl who switches place with her brother to be trained as a page.
All of Terry Pratchett's books.
All of those I think would be suitable for a 15 yr old and I still enjoy them at my age.
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