In his book Electric Factory: Four Decades in Posters and Photographs, Larry Magid describes Jefferson Airplane playing two early shows at the original Factory and calls them "the top band of that era, and the first to travel with their own sound system." On Page 49, Grace Slick is prominently pictured from this very concert, staged at the Spectrum on March 21, 1970 (with John Mayall). The 16-1/2 x 23" index-stock poster rates VG, while the 5-1/2 x 8" paper handbill (pictured on Page 70 of the Electric Factory book) is EX.
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