The document discusses Welsh Nonconformist records from the mid-19th century, when 80% of Wales' population were Nonconformists. It provides information on the growth of Nonconformist chapels over time, describes various types of chapel records that may contain genealogical information, and offers strategies for locating Nonconformist records for Welsh ancestors, such as using census and map resources to identify local chapels and searching a range of potential record types beyond just birth, marriage and death registers.