A fifteen-volume edition of Hamsun's complete works was published in 1954. In 2009, to mark the 150-year anniversary of his birth, a new 27-volume edition of his complete works was published, including short stories, poetry, plays, and articles not included in the 1954 edition. For this new edition, all of Hamsun's works underwent slight linguistic modifications in order to make them more accessible to contemporary Norwegian readers. Fresh English translations of two of his major works, "Growth of the Soil" and "Pan", were published in 1998.