Notes: Title on cover appears as: "TH1R TE3N" [two lines] with the numerals aligned to form the number "13" reading downward and superimposed in cross-hairs. Cover art incorporates binary and Roman numeral representations of the number 13 into a pattern. "Signed First Editions of Science Fiction" and series logo at the top of the signature/limitation page. "Number ___ of 900" near the bottom of the signature/limitation page. Laid in Certificate of Authenticity is dated 22/5/07 so earliest availability would have been June 2007. "Frontispiece by Ed Cox" on the title page.