I'm steadily catching up on old issues of the Judge Dredd Megazine. It's a sister comic to 2000ad that aims for a more adult audience. As such it backs up the strips with articles and a lot from the period I'm reading at the moment (2007-08) are by Alec Worley. He's come in for some heavy criticism (die hard Meg fans demanding to know why so much space is given to a movie reviewer, etc), but he knows his stuff, even if you might not quite agree.
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He did a pretty good article about exploitation, in way of a review of a comprehensive book called "Nightmare USA" by Stephen Thrower.
Amazon link Anyway, I couldn't find it online, so I have gone to the extreme trouble
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of scanning the two pages for you. They are hopefully attached to this post...