Does anyone know of a resource (preferably available online) that provides the exact dates of publication for books? I'm looking for a British book that was published in 1917, and I've managed to narrow it down to the month of May with some searching, but after that I get stuck. I really don't know where else to look; even sites like the British Library's Integrated Catalogue, which is usually very helpful, will only give me years.
Thanks for any help. This is making me CRAZY.
ETA: For the record, the book in question is Siegfried Sassoon's The Old Huntsman and Other Poems.