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- Operas 4
- Operating rooms 6
- Operational calculus 1
- Operations research 9
- Operative obstetrics 1
- Operative otolaryngology 5
- Operative surgery 22
- Operator algebras 3
- Operator theory 70
- Operons 1
- Ophiolite 1
- Ophiolites 2
- Ophthalmia 3
- Ophthalmic lenses 3
- Ophthalmological therapeutics 6
- Ophthalmology 34
- Ophthalmopathies 36
- Opi 4
- Opiacis 24
- Opinió pública 35