Volumes listing tradesmen and wealthier residents were published from the later 18th century to the 1970s. National and regional directories appeared in the 18th century, replaced from the mid 19th century by County directories (eg Cornwall, Worcestershire). Arranged by town and village there are usually listings by trade (bakers, blacksmiths etc.) and an alphabetical listing of gentry or private residents. Usually around 5% of the population appear. From the mid to late 19th century town or street directories were published of cities & larger towns. Up to 10% of the population appear in these and most have a listing arranged by street. Most County directories ceased publication around the Second World War period and most town directories survived until the 1970s. Post 1945 (and even earlier) telephone directories can be a useful source.