The Survey of Anglo-Welsh Dialects (SAWD) was commenced in 1968 under the direction of David Parry of University College, Swansea.
The aim was to record the "conservative forms" of Welsh English spoken in rural locations in Wales.
The survey analysed pronunciation, lexis, morphology and syntax based on interviews with respondents in ninety locations, who were to be over sixty years of age.
The towns chosen were Caernarfon, Carmarthen, Wrexham and the Grangetown area of Cardiff.
[5] Parry, David, A Grammar and Glossary of the Conservative Anglo-Welsh Dialects of Rural Wales: introduction and phonology available at the Internet Archive.