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I can't remember the name or much of the plot of a book I read as a child in the 1970's. It had to do with friendly aliens that looked like humans. They lived covertly on Earth. The book cover had a window that opened in the air that they could travel through. I don't remember much more except that it really stirred my early imagination. I would love to figure out what it was.

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    The plot sounds like Zenna Henderson's People series, but I'm not seeing a cover that matches. – Joe L. Dec 23 '14 at 15:32
  • There are many, many stories about friendly aliens that look like humans. Rain Rain Go Away by Asimov was the first that sprung to mind. – Mr Lister Dec 23 '14 at 20:03

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