TE Lawrence lost the first draft of seven pillars of wisdom:
From WIKI:
Lawrence kept extensive notes throughout the course of his involvement in the Revolt. He began work on a clean narrative in the first half of 1919 while in Paris for the Peace Conference and, later that summer, while back in Egypt. By December 1919, he had a fair draft of most of the ten books that make up the Seven Pillars of Wisdom but lost it (except for the introduction and final two books) when he misplaced his briefcase while changing trains at Reading railway station.[4] National newspapers alerted the public to the loss of the "hero's manuscript", but to no avail; the draft remained lost. Lawrence refers to this version as "Text I" and says that had it been published, it would have been some 250,000 words in length.
In early 1920, Lawrence set about the daunting task of rewriting as much as he could remember of the first version. Working from memory alone (he had destroyed many of his wartime notes upon completion of the corresponding parts of Text I), he was able to complete this "Text II", 400,000 words long, in three months. Lawrence described this version as "hopelessly bad" in literary terms, but historically it was "substantially complete and accurate".