Original 1st printing, 13 & 7/8 x20" concert poster for The Youngbloods, Ace of Cups and John Bauer's Rocking Cloud at the Avalon Ballroom in San Francisco, Ca, on 1/5-7/1968.  
 
Image is #100 the Family Dog/Avalon series. 
 
Art by Charles Laurens Held.
 
The poster is in good vintage condition. There are tackholes on all four corners, a corner bend, a corner smudge, and some light edgewear.