Andre Norton 
The Andre Norton Collection [EPUB ebook] 

Andre Norton was an American writer of science fiction and fantasy, who also wrote works of historical fiction and contemporary fiction. She was the first woman to be Gandalf Grand Master of Fantasy, first woman to be SFWA Grand Master, and first inducted by the Science Fiction and Fantasy Hall of Fame. Plain and simple, she was badass.
The Andre Norton Collection features some her finest writing:
The Gifts of Asti
All Cats are Gray
Plague Ship
Star Born
The Time Traders
Voodoo Planet
Storm Over Warlock
Star Hunter
The Defiant Agents
and
Key Out of Time