| X-ray and high frequency in medicine by Gordon Granger Burdick - 1909 - 318 pages |
| Xanthoudides - 1909 |
| Xenien - 1909 |
| Xenien - 1909 |
| Xenien - 1909 |
| Xenien - 1909 |
| Xenien - 1909 |
| Xenien - 1909 |
| Xenophontis Expeditio Cyri by Xenophon, Wilhelm Gemoll - 1909 - 329 pages |
| Xenophontis Expeditio Cyri by Xenophon - 1909 - 305 pages |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xi Psi Phi Quarterly - 1909 |
| Xian zheng hui ji shi shi lue by Fuqi Li - 1909 - 11 pages |
| XIVth Century Carols Chiefly from the Sloane Ms. A.D.1396 by M. M. Dalglish - 1909 - 46 pages |
| XIXe [i.e. dix-neuvième] siècle: Critiques diverses by Jules Barbey d'Aurevilly - 1909 |
| XIXe [i.e. dix-neuvième] siècle: Philosophes et écrivain religieux et politiques by Jules Barbey d'Aurevilly - 1909 |
| Xylariaceae austro-brasiliensis by Ferdinand Theissen - 1909 - 40 pages |