Correspondence and papers of the Godwin and Shelley families, chiefly William Godwin (1756-1836), philosopher and author; with the correspondence and papers of his family, including his wife, the novelist and essayist Mary Wollstonecraft (1759-97); daughter, the author Mary Shelley (1797-1851); her husband, the poet Percy Bysshe Shelley (1792-1822); and Mary and Percy Bysshe Shelley's son Sir Percy Florence Shelley (1819-89), and his wife, Jane, Lady Shelley (d. 1899)