Sir Gawain and the Green Knight (eds. J.R.R. Tolkien & E.V. Gordon)

No book-club issue is documented for this scholarly Clarendon edition. The real traps are all "first thus": the many Clarendon reprints and corrected impressions issued between 1925 and 1966 under the identical title and imprint (the 1955 corrected reprint among them), and the 1967 second edition revised by Norman Davis, in which the introduction, notes and appendix are largely rewritten. All are routinely mis-catalogued as "first edition" because the title page looks the same — the impression statement and the tipped-in errata leaf are what separate them. The 1975 Allen & Unwin translation is a further "first thus" trap for keyword searches.