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- Rivera Cabezas, Antonio 1
- Rivera Paz, Mariano, 1804-1849 2
- Rivera, Antonio, 1784-1851 1
- Rivera, Rubén 2
- Rivers-El Salvador 1
- Rivers-Regulation-El Salvador 1
- Ríos-El Salvador 1
- Roa, Platón 1
- Road construction 9
- 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