Cushing has two binders about 2.5 inches thick that are nothing but catalogues of all the material they have on bonfire. Literally row after row after row of references listed in an unordered sequence for page after page after page. It took me an hour to just read one binder's content list. And there are at least two collections: the one assembled for the Bonfire Commission and the "Bonfire Tragedy" file. The first is about 16 boxes, the other is about 60 boxes including an offsite warehouse that stores all of the items left at the fence line following the collapse, plus a separate collection with VHS tapes. Add to that everything that is still privately held. Simply put there's a lot.
A fairly good piece about Bonfire's history and influence was published in 2007 by a prof at A&M, look up "The Texas Aggie Bonfire: A Conservative Reading of Regional Narratives, Traditional Practices, and a Paradoxical Place" by Jonathan M. Smith. It can be dry, and sometimes might seem attacking, but its largely an objective work (and does do the service of highlighting the occasional detractors that Bonfire can produce so that they can be corrected!).