Leiden University Library (Rapenburg 70, Leiden, the Netherlands) in 1924. Left to right: (unknown 1), Jacob Wybrand Muller, Elsa Molhuysen-Oppenheim, (unknown 4), Caroline van Loen, (5), (6), director F.C. Wieder, (8), (9), (10), (11), (12), (13), (14)