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- Racism in sports 1
- Radiació ultraviolada 1
- Radio 9
- Radioactive pollution 1
- Rafuls, Josep 1
- Rahola, Víctor 7
- Raigs X 1
- Rail transport 1
- Railroad engineering 3
- Railroad stations 352
- Railroad tunnels 1
- Railroads 567
- Railway platform 7
- Raimon (Cantant valencià) 1
- Rain and rainfall 3
- Rain-water 67
- Ramis, Ros 1
- Ramon Albert 1
- Ramon Amigó, Eudald 5
- Ramon Berenguer I, Comte de Barcelona 2