"The Encyclopedia of Science Fiction" (St. Martin's Press) is probably the most comprehensive reference work on science fiction literature, concepts and authors. Its editors are John Clute and Peter Nicholls. The first edition was published in 1978 and won a Hugo award as the best nonfiction SF book of that year. Since then the work has been constantly updated and revised, culminating in an even more comprehensive second edition in 1993.
Since 1997 there is a companion volume on fantasy, aptly titled "The Encyclopedia of Fantasy" (ed. John Clute/John Grant), as well as an "Illustrated Encyclopedia of Science Fiction (ed. John Clute).

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