| The World's Greatest Books — Volume 15 — Science
Unknown | |
| The World's Greatest Books — Volume 17 — Poetry and Drama
Unknown | |
| The World's Greatest Books — Volume 19 — Travel and Adventure
Unknown | |
| The World's Greatest Books — Volume 20 — Miscellaneous Literature and Index
Unknown | |
| The World's Greatest Military Spies and Secret Service Agents
George Barton | |
| The World's Illusion, Volume 1 (of 2): Eva
Jakob Wassermann | |
| The World's Illusion, Volume 2 (of 2): Ruth
Jakob Wassermann | |
| The world's leading conquerors
Wilson Lloyd Bevan | |
| The world's navies in the Boxer rebellion (China 1900)
Charles Cabry Dix | |
| The Worlds of If
Stanley G. Weinbaum |
