Astudiaeth gynhwysfawr o ddatblygiad ffonolegol yr iaith Gymraeg, a seiliwyd ar ddadansoddiad manwl o 15,000 o enwau lleoedd Ceredigion yn dilyn ymchwil eang o ffynonellau dogfennol a gwybodaeth leol a gasglwyd ar lafar. 21 diagram a map.
Language And History In Wales: The Evidence Of Toponymy; summary i; Acknowledgments ii; Contents iii-vi; General abbreviations vii-x; Introduction pp.1-4; Dialectal Variation; Chapter 1 Phonetic representation pp.5-29; Chapter 2 Phonetics and place-name studies pp.30-40; Chapter 3 The nature of linguistic boundaries pp.41-62; Chapter 4 Dialects pp.63-76; Chapter 5 Features of pronunciation pp.77-119; Chapter 6 Vowel quality pp.120-33; Phonetic Features; Chapter 7 The grapheme pp.134-50; Chapter 8 The grapheme pp.151-65; Chapter 9 The graphemes pp.166-82; Chapter 10 Jod-initial suffixes pp.183-94; Chapter 11 Long pp.195-201; Chapter 12 Palatalization pp.202-16; Chapter 13 Anomalous [*] in penultimate syllables pp.217-24; Chapter 14 Anomalous //-// pp.225-43; Chapter 15 Anomalous //-// pp.244-52; Chapter 16 Anomalous [*] in monosyllables pp.253-59; Chapter 17 Conclusions on anomalous [*] and //-// pp.260-80; Chapter 18 Initial and pp.281-90; Chapter 19 Final pp.291-99; Chapter 20 Final pp.300-03; Chapter 21 Consonant metathesis pp.304-07; Chapter 22 The clusters pp.308-26; Chapter 23 Assorted vocalic features pp.327-40; Chapter 24 Welsh English pp.341-55; Conclusions; Chapter 25 General conclusions pp.356-72; Appendix 1 Some additional features unattested in Middle Welsh texts pp.373-79; Apendix 2 Comments on some figures and maps pp.380-83; Apendix 3 Linguistic terminology pp.384-85; Bbliography
