Subject
- Rhinoceroses1
- Robert, Anne-Jean, 1758-18201
- Robert, Nicolas Louis, 1761-18281
- Rocketry7
- Rosemary1
- Rosicrucians1
- Rothmaler, Erasmus1
- Royal Botanic Gardens, Kew4
- Royal Greenwich Observatory4
- Royal Institution of Great Britain1
- Royal Society (Great Britain)1
- Ruined buildings24
- Salmon, William, 1644-171324
- Salt1
- Salt springs1
- Saltpeter1
- Sapphires1
- Scabies1
- Scales (Fishes)1
- Scales (Weighing instruments)1