Hey Kerry!

You could of course query the revision tables directly through Quarry, but the easiest way is to use the hashtag search tool built by Stephen LaPorte and Mahmoud Hashemi: http://tools.wmflabs.org/hashtags/search/1lib1ref/50. Of course, that only lists the edits where the full hashtag was used, including the hash sign. But given that that's part of the core instructions, I assume most participants do that.