Consists of personal papers of Friend, ranging from 1914 to 1955, the year before he passed away. These include his undergraduate and graduate notebooks, course plans and lecture outlines for seminars and classes he gave at Princeton, correspondence and souvenirs from all aspects of his life (military, academic, and personal), papers he delivered at Dumbarton Oaks symposia, research notebooks from his time abroad, and his scholarly notes, drawings, photographs, and negatives. Professor Friend's notes and papers are primarily on the subjects of medieval iconography and the architecture of cathedrals and theaters in ancient Greece, Rome, and other Mediterranean cultures. The notes also cover medieval painting and mosaic, classical Greek sculpture, and Byzantine art and architecture. Negatives show Byzantine and Latin manuscripts; art and architecture from Greece, Rome, and medieval France; as well as some personal travel photographs.