Coal

https://www.wikidata.org/wiki/Q24489

Field Hierarchy

Parent
Chemistry 28.4M papers	Engineering 23.9M papers	Organic chemistry 12.8M papers	Geography 11.1M papers
History 7M papers	Archaeology 6.3M papers	Waste management 1.5M papers
Current
Coal 270k papers
Child
Coal mining 87.6k papers	Char 34.3k papers	Coal combustion products 15.9k papers	Energy source 11.2k papers
Fluidized bed combustion 10.9k papers	Pulverized coal-fired boiler 10.3k papers	Wood gas generator 9,510 papers	Coal gasification 7,652 papers
Bottom ash 7,616 papers		Bituminous coal 7,518 papers

Trends

Notes

History