A 1950 Neal Cassady letter that inspired Jack Kerouac's spontaneous style in On the Road is heading to auction where it's expected to bring up to $600,000.
Christie's is offering the 18 double-sided-page letter on June 16.
Known as the "Joan Anderson Letter," it was believed lost until it surfaced in 2012 in the discarded files of the now-defunct Golden Goose Press, a San Francisco publishing house where it had been placed in a "to read" pile.
Cassady wrote the 16,000-word letter to Kerouac, his fellow Beat generation figure, about an amorous relationship. Only a fragment, believed to have been copied by Kerouac himself, had been published in 1964 by John Bryan in his "Notes from Underground #1."
Kerouac said in an interview in 1968 that Cassady's letter "was the greatest piece of writing I ever saw" and that it gave him the idea for the "spontaneous style" of On the Road.
"I got the idea for the spontaneous style of 'On the Road' from seeing how good old Neal Cassady wrote his letters to me, all first person, fast, mad, confessional, completely serious, all detailed, with real names in his case, however (being letters)," Kerouac wrote.