Two Joans were on display at Christie’s on June 16, one was the much-missed Joan Rivers with a sampling of her sequined gowns adorning mannequins in the auction house entrance, going on the block the following day. The other was the famed subject of a 1950 letter to Jack Kerouac from his pal, Neal Cassady, long thought lost. You may have read about it 18 months ago, when Jean Spinosa found the letter among her father’s papers in Oakland, California. Then came a bit of legal wrangling among Cassady’s heirs, the Kerouac estate, and the letter’s finder. Because Kerouac claimed this letter was inspiration to his spontaneous prose, the letter has entered legend. Cassady, famed for fast driving and cocksmanship, met Joan Anderson on a Greyhound bus, convincing her to make it with him, the writing fast, rambling, and rhapsodic. Now on display on the auction floor, with only the first of 16-pages showing, the letter held some surprises.