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| questionnaires (1) |
| race relations (1) |
| racial segregation (1) |
| radio (2) |
| rain (6) |
| regime of waters (2) |
| regional cooperation (2) |
| regional planning (2) |
| renewable resources (1) |
| research and development (3) |
| research centres (2) |
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| research workers (1) |
| resource conservation (1) |
| restoration (1) |
| right to information (1) |
| river basins (3) |
| river control (1) |
| rivers (6) |
| role of education (3) |
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| rural areas (2) |
| rural development (4) |
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| rural youth (1) |