| The Problem of China
Bertrand Russell | |
| The Problem of 'Edwin Drood': A Study in the Methods of Dickens
Sir W. Robertson Nicoll | |
| The Problem of Foreign Policy / A Consideration of Present Dangers and the Best Methods for Meeting Them
Gilbert Murray | |
| The Problem of Manflight
James Means | |
| The Problem of the Ohio Mounds
Cyrus Thomas | |
| The Problem of Truth
Herbert Wildon Carr | |
| The Problems of Philosophy
Bertrand Russell | |
| The Problems of Psychical Research / Experiments and Theories in the Realm of the Supernormal
Hereward Carrington | |
| The proceedings of the Canadian Eclipse Party, 1869
E. D. Ashe | |
| The process of gilding and bronzing picture frames
Isaac H. Walker |
