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First published in 1958 under the pseudonym David Osborne, Invisible Barriers is an expansion of the short story "And the Walls Came Tumbling Down" (1957), which was published under the author's own name.
Robert Silverberg has won five Nebula Awards, four Hugo Awards, and the prestigious Prix Apollo. He is the author of more than one hundred science fiction and fantasy novels -- including the best-selling Lord Valentine trilogy and the classics Dying Inside and A Time of Changes -- and more than sixty nonfiction works. Among the sixty-plus anthologies he has edited are Legends and Far Horizons, which contain original short stories set in the most popular universe of Robert Jordan, Stephen King, Ursula K. Le Guin, Gregory Benford, Greg Bear, Orson Scott Card, and virtually every other bestselling fantasy and SF writer today. Mr. Silverberg's Majipoor Cycle, set on perhaps the grandest and greatest world ever imagined, is considered one of the jewels in the crown of speculative fiction.
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