J.K. ROWLING. Lot of four works with signatures. - The Silkworm, Sphere, 2014. First edition.In big 8vo, binding in black cloth, original illustrated dust jacket. Gilt back. Signature of Rowling and Robert Galbraith on titlepage.- The Casual Vacancy, Little Brown, 2012. First edition.In big 8vo, binding in black cloth, original illustrated dust jacket. Signature of Rowling on titlepage.- Two postcards of Hogwarts, with the signature of J.K. Rowling.