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World-building
Author: Stephen L. Gillett
Strictly speaking, this isn't a book, not any more. It started out as a book, the first edition was published in 1979 (edited by Peter Nicholls and John Clute), a second edition, increased to more than twice the length, followed in 1993 (edited by John Clute and Peter Nicholls), and now it has become a website (http://www.sf-encyclopedia.com/). Today it contains nearly 5 million words and just under 16,000 entries, and it is still growing. The number of contributors is immense, they are all recognised authorities, and the entries they write are as thorough and as accurate as you could hope to get. There are other sf encyclopedias, but none of them match this. Quite frankly, if you want to find out anything about science fiction, this is the first place to go, it's as simple as that. There is no other reference book on sf that comes close to matching it.