image of رابرت آنسون هاین‌لاین

رابرت آنسون هاین‌لاین

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Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein is a collection of 27 Robert A. Heinlein short stories, including three that Heinlein never collected in book form. The title is a play on the astronomy concept off the main sequence.