psychedelic rock poster Fillmore

(Lot of 4) Unframed psychedelic rock concert poster, ''Big Brother & the Holding Company/ Sly & the Family Stone,'' by Lee Conklin, Bill Graham, Fillmore West, July 16-21, 1968, King #BG-129-OP-1, sheet: 21 3/16''H x 13''W; unframed psychedelic rock concert poster, ''Big Brother & the Holding Company/ Santana,'' by Rick Griffin, Bill Graham, Fillmore West, Sept. 12-14, 1968, King #BG-136-OP-1,sheet: 22''H x 14''W; unframed psychedelic rock concert poster, ''Big Brother & the Holding Company/ Canned Heat Blues Band,'' by Rick Griffin, Family Dog, Avalon Ballroom, June 8-11, 1967, King #FD-65-OP-1, sheet: 20 1/16''H x 13 14/16''W; unframed psychedelic rock concert poster, ''Motherload/ Big Brother & the Holding Company,'' by Rick Griffin & Bob Seidemann, Family Dog, Avalon Ballroom, May 5-7, 1967, King #FD-60-RP-2, sheet: 20''H x 14''W.