Promo postcard for Alton Kelley's solo show at the Psychedelic Solution Gallery in New York. The theme of the card (same as an identical, but oversized poster) is 4,000,000 years on the road -- i.e. the history of homo sapiens, with a wink to the Grateful Dead's 25 years of touring. Eight prehistoric skulls adorn the poster, too, another wink at the Grateful Dead. The exhibit ran from December 1, 1990 through March 1, 1991. A nice 5 x 7 card in near mint condition.