Between May 1930 and August 1935, Dylan Thomas kept numerous notebooks of poems. They contain the drafts of almost all of the work that would form his first two reputation-making collections, _18 Poems_ (1934) and _Twenty-five Poems_ (1936), and many of those in his third collection, _The Map of Love_ (1939). Thomas sold four of the notebooks, spanning May 1930 to May 1934, to the University of Buffalo in 1941. However, the existence of a fifth notebook, covering the period June 1934 to August 1935, was unknown until 2014, the centenary of his birth. _The Fifth Notebook of Dylan Thomas_ makes this newly-discovered text available to readers and researchers for the first time. It contains the only existing MSS versions of Thomas's most challenging poems, 'I, in my intricate image' and 'Altarwise by owl-light', and fourteen other early poems. It contains facsimiles and full transcripts of the originals, is annotated throughout, and has a full scholarly introduction. Exploring the contexts of these brilliant and experimental lyrics – many with substantial reworkings and variant passages – this landmark publication sheds new light on the creative practice of one of the most important and well-known poets of the twentieth century.