The British Library is further demonstrating its commitment to open knowledge later this month as it hosts a First World War-themed editathon on 29 June.
What will make this session so useful is the Library is making some of its material from the Europeana Collections 1914-1918 project publicly available. These collections, for the most part, are not yet online but a substantial number will be made available the day before the event.
Many of these sources are extremely hard to find. They include many out of print books, official and unofficial trench journals, maps and photographs.