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](https://mathoverflow.net/questions/5179/global-fibrations-of-simplicial-sheaves), but that particular part of the question has not been answered yet.



Joyal's letter to Grothendieck
The letter may be found on Georges Maltsiniotis' [webpage](http://webusers.imj-prg.fr/~georges.maltsiniotis/ps.html) containing material related to Pursuing Stacks. (A [direct link](http://webusers.imj-prg.fr/~georges.maltsiniotis/ps/lettreJoyal.pdf) to the pdf.)


