Digital Unlimited Principles of Political Economy: Abridged with Critical, Bibliographical, and Explanatory Notes, and a Sketch of the History of Political Economy John Stuart Mill General
Digital Unlimited Development of the Phonograph at Alexander Graham Bell's Volta Laboratory Leslie J. Newville General
Digital Unlimited Encyclopaedia Britannica, 11th Edition, "Destructors" to "Diameter": Volume 8, Slice 3 Various General
Digital Unlimited Benign Stupors: A Study of a New Manic-Depressive Reaction Type August Hoch General
Digital Unlimited Aircraft and Submarines: The Story of the Invention, Development, and Present-Day Uses of War's Newest Weapons Willis J. (Willis John) Abbot General
Digital Unlimited The 1893 Duryea Automobile In the Museum of History and Technology Donald H. Berkebile Non-fiction
Digital Unlimited On the Origin of Clockwork, Perpetual Motion Devices, and the Compass Derek John de Solla Price General
