General Knowledge Ecology and Environment Conservation efforts: India and World

वसुंधरा परिषद 1992 च्या 'अजेंडा 21' मध्ये 21 म्हणजे काय?

1

21 महिने

2

21 वे शतक

3

21 अधिकृत चर्चा

4

21 देश

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