"A writer’s library is more than just a collection of books. It is also a piecemeal biography of that writer’s life, and measurably so, as most writers have spent countless hours reading the books that they own or have borrowed, hours that add up to years, perhaps decades, given a long-enough life"
From an essay "My Life in Books" by James P. Blaylock, at Poets&Writers. The full essay is here.
An examination of the notebooks in which Mary Shelley drafted Frankenstein. These two notebooks, one purchased probably in Geneva, the second in England, are now kept in the Bodleian Library, Oxford.