Reports from the Bibliographic Bunker Jed Birmingham on William S. Burroughs Collecting #14: “The Invisible Generation” poster. International Times 5.5. First edition in silver ink. An Installment in Jed Birmingham’s series of the The Top 23 Most Interesting Burroughs Collectibles. (NB: Can anyone provide a better image of the poster?) William Burroughs, notoriously known as…