TITLE: Joyal's letter to Grothendieck
QUESTION [21 upvotes]: Mostly out of curiosity: Where do I find Joyal's letter to Grothendieck in which he defines a model structure on simplicial sheaves?
The question was already asked in this MO post, but that particular part of the question has not been answered yet.

REPLY [27 votes]: The letter may be found on Georges Maltsiniotis' webpage containing material related to Pursuing Stacks. (A direct link to the pdf.)