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Ethnography of seminar discussions?

This is a stab in the dark, because my normal routes for searching aren’t leading me anywhere, and I want to get this query out there before I forget (and I don’t have a “fleeting thoughts” category for the blog): If you know of a good ethnography of seminar discussions in higher ed (either undergrad or graduate), please let me know. Equivalent studies in other disciplines are also relevant (so something in communications that looks like micro-ethnography would certainly qualify).