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- Opera 4
- Operador Municipal d'Energia 3
- Ophthalmology 2
- Optical fibers 11
- Oral communication 3
- Oranges 4
- Oranich, Magda 1
- ORC Barcelona World Championship 1
- Orchestra 7
- Ordas, M. 118
- Ordóñez, Estrella 477
- Orensanz, Angel 27
- Orfenat Ribas (Barcelona) 1
- Orfeó Català 2
- Orfeó Gracienc 4
- Orfeó l’Eco de Catalunya 1
- Orfeó Martinenc 1
- Organ (Musical instrument) 3
- Organic farming 3
- Organic wastes 11