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- RADIO-FREQUENCY IDENTIFICATION 1
- RADIO-FREQUENCY MONITORING OF THE FOREST FUND 1
- RADIOACTIVE SUBSTANCE 1
- RADIOCARBON DATING 1
- RADIOISOTOPE 1
- RADIUS OF CURVATURE 1
- RAIL TRANSPORT 1
- RAILROADS 3
- RAILWAY CARRIAGE 1
- RAILWAYS 1
- RAIN 1
- RAINFALL 1
- RAMETS 1
- RANDOM VARIABLES 1
- RANGING METHOD 1
- RANKED A NUMBER 1
- RANKING 2
- RAPID DETERMINATION OF TOXICANTS 1
- RAPID GROWTH 1
- RARE SPECIES 1