General Knowledge · Important Days
संयुक्त राष्ट्र ने स्टॉकहोम सम्मेलन में किस वर्ष विश्व पर्यावरण दिवस मनाने की नींव रखी थी?
- 11972✓
- 21974
- 31976
- 41973
सही उत्तर देखें
1972
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