forebook

plural forebooks · alternative fore-book

1. A prelude to a book or series of books; a preface.

   At Wisconsin, Galpin also wrote a "forebook" to what was to be an eight-book series on rural life [...]

   2010, Julie N. Zimmerman, Olaf F. Larson, Opening Windows Onto Hidden Lives

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   Could it be that for the writer everything happens in a forebook whose end he cannot see, whose end is in his book?

   2001, Martin McQuillan, Deconstruction