Kerswill also examines the Norwegian dialects that emerged in two towns which were located around smelters built at the head of the Sørfjord branch of the Hardangerfjord in the mid-twentieth century. The towns, Odda and Tyssedal, both drew migrants from different parts of Norway. The workers in Odda came predominantly (86%) from western Norway. In Tyssedal only about one-third came from western Norway; a third came from eastern Norway; and the rest from other parts of the country. The dialects that evolved in these two towns were thus very different from each other.