Original 1st printing 17&1/2 x 22&1/2" concert poster for Country Joe & the Fish appearing with Shocking Blue, Pacific Gas & Electric, the Amboy Dukes (featuring Ted Nugent) and Ambergris at the Aragon Ballroom in Chicago, IL from 6/12-13/1970.  

Art by Laura Green, the image is featured in the Art of Rock book on page 399 (plate 4.208). 

 Medium flat index stock poster is in good to very good (B to B/B+) condition; there is a quartet of large brown tape stains/glue residue marks on the reverse that VERY slightly peek through to the front of the poster, along with a bit of curl to the paper, a series of brown spaltter stains in the lower left/right corners, a few stray soft handling dings here and there and a slight dime-sized discoloration just above the fish, otherwise fine. 

 Very decent-looking example of this semi-uncommon 1970 concert poster from the Aragon.