In addition to a number of published, but relatively scarce resources (such as a copy of the published microfilms of the marked-up Sotheby's catalogues), the Bodleian has a number of unique resources. These include its extensive collection of auction and booksellers' catalogues, many of them annotated (providing, for example, prices, buyers' names, and the identity of some anonymous consignors); a card index of consignors (please apply to Rare Books, rare.books@bodleian.ox.ac.uk, 01865 277102); a card index of the marks of ownership of hundreds of book-collectors (please apply to Rare Books, rare.books@bodleian.ox.ac.uk, 01865 277102).