M
M asked:

Is it canon or not ?

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Todd Yes..., as long as you are aware that it only covers material up through the end of "God Emperor of Dune". As such, it has nothing to do with Frank Herbert's last two Dune books or with Brian Herbert's continuation of the Dune universe.

In other words, it was Frank Herbert endorsed canon up through it's publishing date (1984), but has since been supplanted by books published later.
Eladir In short, semi-canonical as Frank Herbert himself says in the book's foreword: "... As the first "Dune fan," I give this encyclopedia my delighted approval, although I hold my own counsel on some of the issues still to be explored as the Chronicles unfold."

For the longer version with more details, you can read the wikipedia entry.
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