Lower Gondwana sedimentation in Ramgarh coalfield district Hazaribagh, Bihar, India http://127.0.0.1/xmlui/handle/123456789/16848 2026-04-18T06:41:04Z 2026-04-18T06:41:04Z Lower Gondwana sedimentation in Ramgarh coalfield district Hazaribagh, Bihar, India Sen, Debaprasad http://127.0.0.1/xmlui/handle/123456789/16849 2026-01-22T05:36:34Z 1965-12-01T00:00:00Z Lower Gondwana sedimentation in Ramgarh coalfield district Hazaribagh, Bihar, India Sen, Debaprasad 1965-12-01T00:00:00Z