I have almost every magazine from the mid-80's to early 90's that had any articles having to do with GNs/Turbo TAs/GNXs. I have at least 50 or more of them (probably closer to 100). GM High-Tech, Motor Trend, Cars Illustrated, Popular Mechanics, Car Craft, Popular Hot Rodding, Car and Driver, Automobile, Turbo & High-Tech Performance, Autoweek, etc., etc., etc. Even some old MM&FFs with articles on the old GN/Mustang Shootouts at Englishtown.
I'd only consider selling them as a complete lot and I imagine they'd cost a bunch to ship.