JCO: aabout a preface

Hi,
There is a Preface about Bellefleur, in the site, and I want to know where it comes from. There is no such preface in my book. Was it on the book? or was it on another edition?
I'd like to know the resource because I am wondering how to write it in my booklist when I refer to the preface.
Does anyone know?

Yumiko

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