particular the peasant population. Moberg's monumental work was published shortly after the Second World War: the four-volume The Emigrants series (1949–1959), about the Swedish emigration to North America. In this work, Moberg sentimentally depicted a 19th-century couple during their move to the New World; and the many struggles and difficulties they had to endure. Bourgeoisie literature Bourgeoisie literature in the 1930s was written by Agnes von Krusenstjerna, Olle Hedberg and Fritiof Nilsson Piraten. Krusenstjernas portrayal of her class in the Von Pahlen-series (1930-1935) resulted in a furious debate. Notable poets of the era was Johannes Edfelt, Hjalmar Gullberg and Nils Ferlin. The 1940s and 1950s In the 1940s modernist literature known as fyrtiotalism was typically pessimistic with recurring themes like anguish and guilt and the works became increasingly experimental. Stig Dagerman and novelist Lars Ahlin are the best known prose writers of this era while Erik Lindegren and Karl Vennberg were the leading poets. A number of acclaimed female authors such as Stina Aronson, Ulla Isaksson and the poet Elsa Grave also appeared in the 1940s. The literature of the 1950s continued some of the themes of the 1940s but became more ironic and playful with writers such as Lars Gyllensten, Willy Kyrklund and Lars Forssell. Birgitta Trotzig, a major modernist writer whose work focus on existential questions of a religions nature made her breakthrough with De utsatta (The Exposed) in 1957. Poets associated with the 1950s are Werner Aspenström who became one of the most widely read poets in Sweden and the highly influential Tomas Tranströmer who made his debut in 1954 with 17 dikter (17 Poems). The 1960s and 1970s In the 1960s a new socially critical literature emerged that often focused on global perspective and anti-war themes. Journalistic documentary books was a significant literary trend with writers such as Jan Myrdal, Sven Lindqvist and Per Wästberg. Sara Lidman, a celebrated novelist of the 1950s also turned to such political writing in the 1960s, but later returned to writing novels centred on life in a small village in northern Sweden. Authors such as Per Olof Sundman and Per Olov Enquist turned to pseudo-documentary novels. Enquist later had international success with the historical novel Livläkarens besök (1999, The Visit of the Royal Physician). Lars Gustafsson, best known for his partially autobiographical novel series Sprickorna i muren (1971–78; "The Cracks in the Wall"), railed against the bureaucratic Swedish welfare state