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- Road construction-El Salvador 4
- Road construction-El Salvador-San Miguel 2
- Road construction-Guatemala 1
- Roads-Economic aspects 1
- Roads-El Salvador 1
- Roads-Maintenance and repair 5
- Roads-maintenance and repair 1
- Roads-Maintenance and repair-El Salvador 2
- Roads-Maintenance and repair-El Salvador-Sonsonate 2
- Roads-Taxation 1
- Robespierre, Maximilien, 1758-1794 1
- Robinson, Henry Morton, 1898-1961 1
- Robledo, Gregorio 1
- Robotics 1
- Robots-Control systems 1
- Robótica 1
- Roca, Julio Argentino, 1843-1914 2
- Rock mechanics 1
- Rockstroh, Edwin 1
- Rockstroh, Edwin, 1850-1909 1