Incunabula Short Title Catalogue (ISTC)
The international database of 15th-century European printing
The international database of 15th-century European printing
| 4 | Oria C |
| 2 | Oria Sem |
| 1 | Orihuela BCap |
| 67 | Orihuela BP |
| 17 | Orihuela Franciscanos |
| 2 | Orihuela Rafal |
| 1 | Orihuela S.Francisco |
| 7 | Orihuela Sem |
| 9 | Oristano Sem |
| 161 | Orléans BM |
| 2 | Orsa Parish |
| 4 | Orte Sem |
| 116 | Orvieto C |
| 1 | Orvieto Sem |
| 3 | Osaka, Morisawa & Co |