S The Spiritual Guidance of Man and of Mankind Rudolf Steiner The Spiritual Guidance of Man and of Mankind Rudolf Steiner
B Brigadier Frederick And, The Dean's Watch Erckmann-Chatrian Brigadier Frederick; and, The Dean's Watch Erckmann-Chatrian
O On the History of Gunter's Scale and the Slide Rule During the Seventeenth Century Florian Cajori On the History of Gunter's Scale and the Slide Rule During the Seventeenth Century Florian Cajori