history of the term “dirty concrete”

Earlier today I wrote a long-ish blog post on netpoetic (a communal blog on digital poetry/poetics and e-literature) on my (not-over-yet) search for the origin of the term “dirty concrete.” I have been trying to figure out who first came up with this term for an essay I’m working on, “Marking as Meaning: Reading Steve McCaffery’s Dirty Concrete as Digital D.I.Y.”; in it I’ve tried to delineate a history of the term “dirty concrete” – a term which is frequently used to describe a messy, typed-over aesthetic of concrete poems by McCaffery as well as bpNichol and bill bissett. I thought it worthwhile posting some of the bits and pieces I’ve picked up along the way on this strange, long journey to discover the origin of the term – “the origin of the term “dirty concrete poetry” (en route to digital D.I.Y.).”