 "In Parenthesis", a modernist epic poem by David Jones (1895–1974) first published in 1937, is probably the best known contribution from Wales to the literature of the First World War.An important development, beginning in the 1930s and 1940s was a tradition of working class novels actually written by working-class background writers.Among these were coal miner Jack Jones, James Hanley, whose father was a stoker and who also went to sea as a young man, and coal miners Lewis Jones from South Wales and Harold Heslop from County Durham.