More about artifacts than art, “Beat Culture and the New America,” curated by Lisa Phillips, includes a plethora of first editions, journals, manuscripts, ’zines, chapbooks, posters, letters, and jazz-album jackets, all entombed in vitrines. There are also TV clips and films, recorded poetry, and documentations of happenings, as well as a reading gallery stocked with shiny editions of Beat lit. An elaborate, wall-sized timeline charts significant events in the Beat world against significant events in the world at large, while newsprint flyers give the lowdown on the New York, Los Angeles, and