Photographs and 2 letters to Crum from Quibell concerning Coptic discovery at Saqqara - all published Quibell, Excavations at Saqqara II (Cairo, 1909).
Material relating to W. Pleyte & P.A.A. Boeser, Catalogue du Musée d’Antiquités à Leide (Leiden, 1897). Includes correspondence from P.A.A. Boeser, 1929-1930.