Ball Mill Grinding of Coal http://127.0.0.1/xmlui/handle/123456789/719 2026-04-17T13:36:07Z 2026-04-17T13:36:07Z Studies on Ball Mill Grinding of Coal Datta, B. C. http://127.0.0.1/xmlui/handle/123456789/720 2016-11-03T10:05:21Z 1957-01-01T00:00:00Z Studies on Ball Mill Grinding of Coal Datta, B. C. 1957-01-01T00:00:00Z