Check out this five sided Vulcan Gas Company handbill by Jim Franklin. The shows were August 16 - 17, 1968 with the Zackary Thaks (mispelled: Thacks), Winter, New Atlantis.
The Zackary Thaks widely regarded as of the best garage bands of the sixties. They released a handful regionally distributed singles in 1966 and 1967; some were hits in their hometown of Corpus Christi, TX.
Leaning heavily (as were so many bands) on the British heavyweights like the Stones, the Kinks, and the Yardbirds, the group added a charge of Texas raunch to their fuzzy, distorted guitars and hell-bent energy.
Most importantly, they were good songwriters, with the breakneck "Bad Girl" (later compiled on Pebbles, Vol. 2), "Won't Come Back," the sizzling "Face to Face," "Can't You Hear Your Daddy's Footsteps," and the folk-rock/Merseybeat hybrid "Please" ranking among the peak of American '60s garage rock.
Their 1967 singles found the band moving into psychedelic territory; some songs sported a Moby Grape influence, and some good melodic numbers were weakened by poppy arrangements that recalled the Buckinghams and Grass Roots.
Lead singer Chris Gerniottis, only fifteen when Zakary Thaks began making records, joined another interesting Corpus Christi garage/psychedelic group, the Liberty Bell but returned later. Sadly, the band did not repeat its early success, splitting up in the early 1970s.