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Letters from Mu (Part I) was published as an artist's book in France in 2000 by Voix Editions, with over 50 drawings by the Swiss artist Gilgian GelzerExcerpts from this work-in-progress appear in First Intensity (#12, Spring 1999) and Pierogi Press (#9, Fall 2002). The book is available through Printed Matter or directly from the publisher.

ADDENDUM:
A second installment from "work in progress," Fragments from Mu:
A sequel
, was published in 2007; a third installment, Nexus of Evil: Late fragments, 1-7, appeared in 2009. Both are published by First Intensity Press.