  A further difficulty in getting to grips with Heidegger's later philosophy is that, unlike the early thought, which is heavily centred on a single text, the later thought is distributed over a large number and range of works, including books, lecture courses, occasional addresses, and presentations given to non-academic audiences. So one needs a navigational strategy. The strategy adopted here will be to view the later philosophy through the lens of Heidegger's strange and perplexing study from the 1930s called Contributions to Philosophy (From Enowning), (Beitrage zur Philosophie (Vom Ereignis)), henceforth referred to as the Contributions. (For a book-length introduction to the Contributions, see Vallega-Neu 2003. For a useful collection of papers, see Scott et al. 2001.) The key themes that shape the later philosophy will be identified in the Contributions, but those themes will be explored in a way that draws on, and make connections with, a selection of other works. From this partial expedition, the general pattern of Heidegger's post-turn thinking, although not every aspect of it, will emerge.