The Walter Edward Dandy Collection spans his entire career. Series include correspondence, manuscripts, scientific notes, student notebooks, patient lists, and reprints. Manuscripts pertain to such topics as aneurysms, general brain surgery, benign tumors in the third ventricle of the brain, and intracranial neoplasms in children. Of special interest are Dandy's scientific notes on hypophysectomy experiments. Also included in the collection is a plaster-cast mask of Dandy. The collection is a strong resource for studying the development of the field of neurosurgery.