Genealogists and local historians have probably seen every birth, marriage, death and census record available, and are adept at unsing the internet for research. However, once they have learnt everything they can from them, the next step is reading and understanding older documents.
Welsh genealogy is usually included with its English cousin, but there are significant differences between the two, and anyone wishing to trace their Welsh ancestry will encounter peculiarities that are not covered by books on English family history. Welsh Genealogy covers all of this as well as the basic Welsh needed by family historians,