Notes: International edition: US $8.00 (source unknown) (later) Price £4.99 is from BL (below), a British Library prepublication record with implausible page count. For two ISBN 0-14-043381-3 and 0-14-043406-2 (see at ISFDB) --both reported by Amazon UK/US and WorldCat library record as 1993, Penguin Classics-- Amazon UK as of 2019-06-13 provides front cover images of the same design, different illustrations (as linked from ISFDB records), and states: • (043381-3) "Paperback – 7 Jan 1993"; "12.8 x 2.4 x 19.8 cm" • (043406-2) "Mass Market Paperback – 26 Aug 1993"; "13.7 x 2.4 x 19.1 cm"; Anniversary edition WorldCat library records (OCLC) variously report size 18, 19, and 20cm; page count 520 or xl+520; and various Penguin Books locations. OCLC 902414629 may report that this is Penguin Classics #1. British Library (BL, below) --a stated prepublication record, or "sight unseen"-- reports price £4.99 and "[416]p. ; 18cm." Despite the implausible page count that price is entered above, lacking another report.