| Comments | Helpful | |
|---|---|---|
| Joint History Project | 0 | 100% |
| Fotoalbums Arius van Tienhoven, 1912-1915 | 0 | 75% |
| Valjevo – Grad bolnica (1914-1915) | 0 | 100% |
| Historical Archives of Greek Youth | 0 | 0% |
| MihajloPupin.info | 0 | 0% |
| Retronaut | 0 | 0% |
| Museums, Libraries and Archives Council – Cornucopia | 0 | 0% |
| Internet Archive | 0 | 100% |
| H-Net Discussion Networks | 0 | 0% |