The Boldero Library held a small collection of works by and about former members of the Middlesex Hospital Medical School, particularly those of the nineteenth and early twentieth centuries. This collection includes books by Sir John Bland-Sutton, surgeon and friend of Kipling. There is also a small collection of classic books on urology dating from 1811 onwards. This combined collection, known as the Middlesex Collection, is currently held in the Cruciform Library.