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- Ricardo Alberto Ferreira 1
- Ricardo Alberto Neto Ferreira 2
- Ricardo Brant Pinheiro 9
- Rio Cristalino deposit 1
- Rio Grande 1
- Rio Grande do Norte 4
- Rio Pandeiros 2
- Rio Potengi 1
- Riscos nucleares 1
- Risk assessment 2
- risk assessment 1
- Risk managment 1
- rivers 4
- Robert Hofstadter 5
- Roberto Crepaldi 2
- Roberto Stasiulevicius 1
- Roberto Vicente Americano 1
- rocks 1
- rolling 2
- Rotating disk removal systems 1