Original 1st printing 11 x 17" boxing-style concert poster for a pair of May 1970 shows held at the Minneapolis (MN) Auditorium; the performances advertised are Chicago with the Illinois Speed Press on 5/10 (top) and Jefferson Airplane with Crow on 5/15 (bottom). Medium-thick flat vellum stock is in very good to excellent (B/B+ to B+) condition; a hard horizontal center crease/fold with an additional small horizontal crease traversing the top edge, a set of small pin/tack holes (all four corners), couple of very light scattered surface scuffs and dings and a slight diagonal bend through the lower part of the "A" of "Airplane", otherwise a fine-looking example of this VERY obscure regional Airplane/Chicago poster with a simple sharp boxing-style graphic.