IV.1 Presses: items relating to other presses, such as Black Cat Press and Castle Press. IV.2 Colleges, Universities, and Schools: items relating to universities, such as Caltech, Occidental, and UCLA. IV.3 Museums and Libraries: items relating to museums and libraries, such as LACMA, Huntington Library, and Clark Library. IV.4 Societies, Clubs, Associations: items relating to clubs that Ritchie belonged to, such as Zamorano, Rounce & Coffin.