The March 2008 New York Review of Science Fiction contains the second installment of Tom Purdom's fascinating science fiction memoir. While the NYRSF isn't online, Purdom has posted the first nine installments of his memoir on his website and I'd highly recommend them for anyone interested in the SF field of the 1950s and 60s. Of particular interest is episode eight (titled "Doubling Up"), which explores Purdom's adventures in the Ace Double field and the writing of his novel "I Want the Stars."
