Babel-17 - Delany, Samuel R.

In the far future, after human civilization has spread through the galaxy, communications begin to arrive in an apparently alien language. They appear to threaten invasion, but in order to counter the threat, the messages must first be understood.

Babel-17 2010, Gollancz, London

ISBN-13: 9780575094208

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Babel-17 1999, Gollancz, London

ISBN-13: 9781857988055

Mass-market paperback

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Babel-17 1975, Ace Books

ISBN-13: 9780441045952

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