Here's a list I drew up back when I first started using M&M. It doesn't include the specifics on all the Bulletin of the Board of Celtic Studies articles.
An asterisk preceding an item indicates that the entire contents appear to be pre-1600 or thereabouts; a question mark indicates that this is probably the case.
| M&M's abbrev. | Date | Source |
|---|---|---|
| AB | Edward Lhuyd, Archaeologia Britannica | |
| *ADClun | 1328-1561 | G.E.A. Raspin, 'Transcript and descriptive list of the Medieval Court Rolls of the Marcher Lordship of Clun' |
| ?AMCC | Ancient Monuments of Caernarfonshire, ii, Central. | |
| *AnglCourt 1346 | G. Peredur Jones, 'Anglesey Court Rolls 1346' | |
| AnglMuster | E.Gwynne Jones, 'An Anglesey Muster Book' | |
| *AnglPleas | 1500-16 | Hugh Owen, 'Plea Rolls of Anglesey 1500-1516' |
| *AnglRent | 16th C | T. Jones Peirce, 'An Anglesey Crown rental of the 16th Century' |
| *AnnCamb | 11th C | J. Williams ed., Annales Camriae |
| ArchCamb | Archaeologia Cambrensis | |
| ArthurianLegend | John Rhys, Studies in the Arthurian Legend | |
| B | Bulletin of the Board of Celtic Studies | |
| Bardsley | C.W. Bardsley, English Surnames | |
| Bartr | P.C. Bartrum, Welsh Genealogies (Bartrum) | |
| *Bartrum | P.C. Bartrum, Early Welsh Genealogical Tracts (Bartrum (1)) | |
| *BBC | 13th C | J. Gwenogvryn Evans ed., The Black Book of Carmarthen |
| *BBStD | 1326 | J.W. Willis-Bund ed., The Black Book of St David's |
| ?BDewi | 6th C | D. Simon Evans, Buchedd Dewi |
| ?Bolde | C.A. Gresham, 'The Bolde Rental' | |
| BrRadnor | Brecon and Radnor (electoral rolls) | |
| *BrSaes | ?682-1461 | Thomas Jones ed. Brenhinedd y Saesson |
| *BT | 14th C | J. Gwenogvryn Evans ed., The Book of Taliesin |
| *BTywPen20 | 680-1332 | Thomas Jones ed., Brut y Tywysogion, Peniarth MS20 |
| *BTywRBH | 680-1282 | Thomas Jones ed., Brut y Tywysogion, Red Book of Hergest |
| Bulkeley | 1734-1760 | Hugh Owen, 'The diary of William Bulkeley of Brynddu, Anglesey' |
| *BYale | 1315 | T.P. Ellis ed., The First Extent of Bromfield and Yale |
| *CA | late 6th C | Ifor Williams ed., Canu Aneirin |
| CaernHS | Transactions of the Caernarfonshire Historical Society | |
| *CaernCR | 1361-1402 | G.P. Jones and Hugh Owen ed., Caernorvon Court Rolls |
| *CaernQSR | 1541-1558 | W. Ogwen Williams ed., A Calendar of Caernarvonshire Quarter Sessions |
| *CalACW | 13th-15th C | J. Goronwy Edwards ed., A Calendar of Ancient Correspondence |
| CatAncDeeds | A descriptive catalogue of ancient deeds in the Public Record Office | |
| *CalInquEdwIII | 14th C | Calendar of Inquisitions post mortem and other analogous documents preserved at the Public Records Office (vol.7 to 14) |
| *CalPatRolls | 1569-72 | A Calendar of PatentRolls: Elizabeth I, vol. V, 1569-72 |
| ?CAP | William Rees ed. A Calendar of Ancient Petitions Relating to Wales | |
| CAstellGorfonMS | Early 18th century MS of S. Wales genealogies (Castell Gorfod MS 8 at NLW) | |
| Census 1861 | General Register Office, Census Returns for England and Wales 1861 | |
| *CensCalais | 1540 | Census of the Pale of Calais, c. 1540, Longleat MS 60 |
| CD | John Morris-Jones, Cerdd Dafod | |
| Clark | G.T. Clark, Limbus Patrum Morganiae et Glamorganiae | |
| *CLlH | 9th-10th C | Ifor Williams ed. Canu Llywarch Hen |
| CRHaverford | B.G. Charles ed. A Calendar of the records of the borough of Haverfordwest | |
| *CRW | ~1584 | T.H.Parry-Williams ed. Carolau Richard White |
| CFhC | T.H.Parry-Williams ed. Canu Rhydd Cynnar | |
| *CT | 6th C | Ifor Williams ed. Canu Taliesin |
| *CwttaCyf | 1425-1456 | D.R. Thomas ed. Y Cwtta Cyfarwydd |
| Cy | Y Cymmrodor | |
| CymmTrans | Transactions of the Honourable Society of Cymmrodorion | |
| *DGG | -1370 | Ifor Williams and Thomas Roberts ed. Cywyddau Dafydd ap Gwilym a'i gyfoeswyr |
| ?DLancaster | William Rees ed. A Survey of the Duchy of Lancaster lordships | |
| DNB | The Dictionary of National Biography | |
| *DPO2 | 'early' | Theophilus Evans, Drych y Prif Oesoedd 2nd ed. |
| DTel | The Daily Telegraph | |
| DWB | The Dictionary of Welsh Biography down to 1940 | |
| *Dwnn | 1568-1616 | Lewys Dwnn Heraldic Visitations of Wales and Part of the Marches |
| EANC | R.J.Thomas, Enwau afonydd a nentydd Cymru | |
| EEW | T.H.Parry-Williams, The English Element in Welsh | |
| Ekwall | Eilert Ekwall, The Concise Oxford Dictionary of English Place-names | |
| ELISG | J.Lloyd-Jones, Enwau lleoedd Sir Gaernarfon | |
| ?ELSCumberland | Exchequer Lay Subsidy of Cumberland | |
| E.R. | Electoral Rolls | |
| ExchProcWales | Emyr Gwynne Jones ed., Exchequer Proceedings concerning Wales | |
| ExProJamesI | T.I.Jeffreys-Jones ed., Exchequer Proceedings | |
| concerning Wales in tempore James I FC | O.H.Fynes-Clinton, The Welsh Vocabulary of the Bangor district | |
| Fenton | Richard Fenton, A Historical Tour through Pembrokeshire | |
| FlintsPlace | Ellis Davies, Flintshire Place-names | |
| G | early | J. Lloyd-Jones ed. Geirfa Barddoniaeth gynnar Gymraeg |
| Gazetteer | Elwyn Davies ed. A Gazetteer of Welsh Place-names | |
| *GDG | 1320-1370 | Thomas Parry ed. Gwaith Dafydd ap Gwilym |
| GeiriadurMawr | H.Meurig Evans & W.O. Thomas ed. Y Geiriadur Mawr | |
| *GGl | 1435-1493 | Ifor Williams & J. Llywelyn Williams ed. Gwaith Guto'r Glyn |
| GlamCartae | G.T.Clark CArtae et alia munimenta... | |
| GlamHearthTax | 1671 | Glamorgan Hearth Tax, ca. 1671 |
| Gower Manorial | 17th C | Various Gower manor rolls of the 17th cent. |
| *GowerSurvey | 1594-5 | Gower Survey of 36 Elizabeth I, 1594-5 |
| GPC | Geiriadur Prifysgol Cymru | |
| *GTA | 1465-1525 | T. Gwynn Jones ed. Gwaith Tudur Aled |
| Guide | Edward MacLysaght, A Guide to Irish Surnames | |
| H | J. Morris-Jones & T.G. Parry-Williams ed. Llawysgrif Hendregadredd | |
| HAsaph | R. Thomas, A History of the Diocese of St. Asaph | |
| ?HanesEgAnni | Thomas Rees & J.Thomas ed. Hanes Eglwysi Annibynol Cymru | |
| HBR | Theophilus Jones, History of Brecknockshire | |
| HM | J.A. Bradney, A History of Monmouthshire | |
| HRads | Jonathan Williams, A general history of the County of Radnor | |
| HW | J.E. Lloyd, A History of Wales | |
| *IGE | 1320-1398 | Henry Lewis, Thomas Roberts and Ifor Williams ed. Cywyddau Iolo Goch ac eraill |
| *IGE2 | 1320-1398 | Cywyddau Iolo Goch ac eraill 2nd ed. |
| *InvECP | 1377-?1500 | E.A. Lewis ed. Inventory of Early Chancery Proceedings |
| JEG | J.E. Griffith ed. Pedigrees of Abglesey and Caernarvonshire Families | |
| L'Estrange Ewen | C.G. L'Estrange Ewen, Surnames of the British Isles | |
| Ley&Main | 1673-79 | W.Beaumont ed. Tracts...respecting the Legitimacy of Amicia, Daughter of Hugh Cyveliok |
| *LGC | 1420-89 | J. Jones & W. Davies ed., Gwaith Lewis Glyn Cothi |
| *LHEB | Kenneth Jackson, Language and History in Early Britain | |
| *LL | 1120-1140 | J. Gwenogvryn Evans ed., The text of the Book of Llan Dav |
| LP | Henry Lewis & Holger Pedersen, A Comparative Celtic Grammar | |
| *L&P | 1509-1547 | Calendar of Letters and Papers, foreign and domestic, of Henry VIII, 1509-1547 |
| LpOswestry | W.J. Slack ed. The Lordship of Oswestry | |
| ?MA | Owen Jones, William Owen & Edward Williams ed.,The Myvyrian Archaiology of Wales | |
| Matthews | C.M. Matthews, English Surnames | |
| *MerLSR | 1292-3 | Keith Williams-Jones ed., The Merioneth Lay Subsidy Roll 1292-3 |
| ML | 18th C | J.H. Davies ed., The Letters of Lewis, Richard, William and John Morris |
| MLIndex | Hugh Owen, 'Index to the Morris Letters' | |
| *MLSW | 1415-1536 | T.B.Pugh ed. The Marcher Lordships of South Wales |
| MontColl | The Montgomeryshire Collections; the Transactions of the Powysland club | |
| NLWJ | The National Library of Wales Journal | |
| NLWPlymouth C | MS Deeds in the Plymouth Collection at the NLW | |
| OIG | Orgraff yr Iaith Gymraeg | |
| OG | J.E. Lloyd, Owen Glyndower | |
| Paroch | 1660-1709 | Edward Lhwyd, Parochialia |
| Phillimore | Henry Owen ed. The description of Pembrokeshire | |
| *PKM | before 13th C | Ifor Williams ed., Pedeir Keinc y Mabinogi |
| *Pre-conqDomes | 1086 | Olof von Feilitzen, Pre-Conquest Personal Names of the Domesday Book |
| PRCaerwent | J.A. Bradney ed., Parish Registers of Caerwent | |
| PRConway | Alice Hadley ed., Parish Registers of Conway | |
| PRLlanbadoc | J.A. Bradney ed., Registrum Antiquum de Llanbadoc | |
| PRLlanddewi | J.A. Bradney ed., Parish Registers of Llanddewi Rhydderch | |
| PRLlanfihangel | J.A. Bradney ed., Registrum Antiquum de Llanfihangel Ystern Llewern | |
| PRLlantrithyd | H. Seymour Hughes ed., The Registers of Llantrithyd | |
| PRLlCrossenny | J.A. Bradney ed., Parish Registers of Llantilio Crossenny | |
| PRSannan | R. Ellis ed., The Parish Registers of Llansannan | |
| PRWhicham | J.F. Haswell trans., Parish Register of Whicham | |
| *PWLMA | 1277-1536 | R.A. Griffiths, The Principality of Wales in the Later Middle Ages: South Wales 1277-1536 |
| RadsSoc | Transactions of the Radnorshire Society | |
| *RB | 1382 | John Rhys & J. Gwenogvryn Evans ed., The Text of the Bruts from the Red Book of Hergest |
| ?RCA | ~1547 | E.A. Lewis & J. Conway Davies ed., Records of the Court of Augmentations |
| Reaney | R.H.Reaney, A Dictionary of British Surnames | |
| *RecCA | 15th C | Henry Ellis ed., The Record of Carnarvon |
| ?RecDenbLp | John Williams ed., The records of Denbigh and its Lordships | |
| Richards1753 | Thomas Richards, A British or Welsh-English Dictionary | |
| *RP | 1382-1410 | J. Gwenogvryn Evans ed., The Poetry in the Red Book of Hergest |
| *RM | 1382-1410 | J. Gwenogvryn Evans ed., The Text of the Mabinogion...from the Red Book of Hergest |
| ShrewsburyBR | H.E. Forrest ed., Shrewsbury Burgess Roll | |
| ShropshireParish | Shropshire Parish Register Society | |
| StDavid'sDiocese | Index of Marriages, Archdeaconry of Carmarthen, Diocese of St.David's | |
| StarCP | 1485-1641 | Ifan ab Owen Edwards ed., A Catalogue of Star Chamber Proceedings |
| StTG | 1936 | D.J. Williams, Storiau'r Tir Glas |
| SurveysGK | C. Baker and G.G. Francis ed., Surveys of Gower and Kilvey | |
| *SurveyPCalais | mid 16th C | Mid-sixteenth century MS survey of the Pale of Calais |
| SWMRS | South Wales and Momouthshire Society Publications | |
| TAAS | Transactions of the Anglesey Antiquarian Society | |
| *Taxatio | 1291 | Taxatio Ecclesiastica, Angliae et Walliae, auctoritate P. Nicholai IV c A.D. 1291 |
| TC | T.J. Morgan, Y Treigladau a'u Cystrawen | |
| TCWAAS | Transactions of the Cumberland and Westmorland Antiquarian and Archaeological Society | |
| TDW | Samuel Lewis, Topographical Dictionary of Wales | |
| Theater du Mond | Thomas Parry ed., Theater du Mond | |
| Thomas | mid 18th C | William Thomas of Michaelston-super-Ely, mid-eighteenth century diary |
| TLIM | G.J. Williams, Traddodiad Llenyddol Morgannwg | |
| ?TYP | Rachel Bromwich ed., Trioedd Ynys Prydein | |
| *ValEcc | ?1509-47 | Valor Ecclesiasticus tempore Henr. VIII |
| *ValNorwich | 1254-6 | W.E. Lunt ed., The Valuation of Norwich |
| WATU | Melville Richards, Welsh Administrative and Territorial Units | |
| WMail | The Western Mail newspaper | |
| WG | John Morris-Jones, A Welsh Grammar | |
| *WM | mid 14th C | J. Gwenogvryn Evans ed., The White Book Mabinogion |
| WPortBooks | E.A. Lewis ed., Welsh Port Books | |
| WS | William Salesbury, Dictionary of English and Welsh |