Welsh genealogical research is a daunting task for those in America of Welsh Ancestory. An understanding of the basic Welsh resources available to the genealogist is at least a place to begin. The foundational books for Welsh genealogical research are:
"Heraldic Visitations of Wales and Part of the Marches; Between The Years 1586 and 1613, Under The Authority of Clarencieux and Norroy, Two Kings At Arms, By Lewys Dwnn, Deputy Herald At Arms; Transcribed From The Original Manuscripts, and Edited, With Numberous Explanatory Notes; By Sir Samuel Rush Meyrick, Knt. K.H.LL.D. F.A.S. and Honorary Member of The Cymmrodorion and Gwyneddigion Soieties, Etc., Etc."
Wow, what a title! This was published in two volumes 1846 for the Welsh Manuscript Society by William Rees and Longman & Co., H. Hughes, D. Williams, London; and Parry, Chester. It has recently been republished in Wales by Bridge Books, Wrexham. Copies can be ordered but are fairly expensive.
The second reference is:
"Annals and Antiguities of The Counties and County Families of Wales", by Thomas Nicholas, M.A., PhD, F.G.S. The books are listed as "Containing A Record of All Ranks of The Gentry, Their Lineage, Alliances, Appointmets, Armorial Ensigns, and Residences; Ancient Pedigrees and Memorials of Old and Extinct families; Notices of the History, Antiquities, Physical Features, Chief Estates, Geology, and Industry of Each County; Rolls of High Sheriffs and Members of Parliment For Three Hundred Years". The text states that all information was compiled by direct visitation of the counties, and from reliable and original sources. [Dwnn being the primary source.] First published London, 1872, it has had a second printing 1875, and by Genealogical Publishing Co., in 1991. It is also in two volumes.
These two references are the foundation for Welsh genealogical research.