state gov WBPSC Miscellaneous Services Mock Test 2023 General Knowledge Indian Geography Indian Economic and Human Geography

ভারতে কয়লা খনিগুলো জাতীয়করণ করা হয়

1
5ই এপ্রিল, 1952
2
4 ঠা মার্চ, 1956
3
19ই এপ্রিল, 1961
4
1লা মে, 1973
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