Read Neal Cassady’s a never-before-published excerpt from the infamous “Joan Anderson Letter” at Alta Magazine.Article continues after advertisementRemove Ads The audience at the Beat Museum in San Francisco’s North Beach was small, and it fit a certain profile. About 20 people, mostly older—gray hair, jeans and open sandals—occupied a few rows of folding chairs in … Continue reading The Beats’ Holy Grail: The Letter That Inspired On the Road