Who wrote the only book on the NY Times bestseller list to be moved
from fiction to nonfiction (and what was the title)?

Hello.

The book was "Maus II" (1991) by Art Spiegelman.


"The New York Times Book Review listed MAUS II in its hardcover
fiction bestseller list. Spiegelman wrote to the Times, pointing out
that it was by no means fiction: "It's not as though my passages on
how to build a bunker and repair concentration camp boots got the book
onto your 'Advice, How-to and Miscellaneous' list. It's just that I
shudder to think how David Duke - if he could read - would respond to
seeing a carefully researched work based closely on my father's
memories of life in Hitler's Europe and in the death camps, classified
as fiction."
 In an unprecedented move, the Review published Spiegelman's letter
and then shifted the book to its non-fiction list."
http://www.theage.com.au/articles/2004/03/26/1079939832769.html?from=storyrhs

"Maus II, was on the NY Times lists for both hardcover fiction and
non-fiction (it was originally mis-classified as fiction), back in
1991-2."
http://www.comicon.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=36&t=001429

-------
search strategy:
"originally * classified as fiction"
"maus ii" fiction "new york times"

If this answer is correct, and I think it must be, it arrived within
moments of my asking. Amazing!

Thank you for the tip.
-juggler