Original 1st printing (no-bands listed version) 24 x 18" concert/event poster for the 2nd Sky River Rock Festival and Lighter Than Air Fair, held in Tenino, WA from 8/30-9/2/1969.

 Design (photograph) by Ben Spicer, image is featured in the Art of Rock on page 258 (plate 3.8). Although no bands are listed, the Festival featured appearances by Quicksilver Messenger Service, Buddy Guy, the Youngbloods, Country Joe and The Fish, Sons of Champlin, Pacific Gas & Electric, James Cotton, New Lost City Ramblers, the Flying Burrito Brothers (with Gram Parsons), the Steve Miller Band and MANY more.. 

 Medium-thick flat index stock poster is in excellent (B+) condition; aside from a few soft handling dings, a stray surface mark/pin-prick spot/stress bend or two and a soft/light moisture stain along the top margin, this example can't be beat.

Really neat-looking period piece (mud people!) from the AOR book, check out fan-shot footage of the event HERE;

https://www.youtube.com/watch?v=KmPoJdu8lSs