Updates of listings of published versions and references relating to Rubáiyát of Omar Khayyám

These files provide updates of listings of published versions of the <em>Rubáiyát </em>of Omar Khayyám and references relating to <em>Rubáiyát</em>. They form part of an archive of research data relating to the spread and influence of the <em>Rubáiyát</em> of Omar Khayyám. The data have been compiled by independent researchers W H (Bill) Martin and Sandra Mason; their contact details are in the README file. The files comprise a number of searchable listings relating to the poem and its different manifestations. This section of the archive contains two database tables updating earlier material to September 2018<em>.</em> The first of these, ROKlist2018, provides a listing of over 1750 editions or reprints of the poem, in different languages and translations, which we know either to exist or to have been identified by other compilers of <em>Rubáiyát </em>bibliographies. The second database ROKref2018 lists more than 500 books, articles and other material relating to the <em>Rubáiyát of Omar Khayyám</em>, which we have identified in the course of our research. Further details of sources, and of the fields and codings used in the databases, are given in the accompanying README document.