Coal

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

Field Hierarchy

Parent
Chemistry 28.9M papers	Engineering 25M papers	Geography 13.2M papers	Organic chemistry 12.9M papers
History 8M papers	Archaeology 6.9M papers	Waste management 1.6M papers
Current
Coal 287k papers
Child
Coal mining 93.7k papers	Char 34.1k papers	Coal combustion products 16.2k papers	Fluidized bed combustion 11.8k papers
Energy source 11.4k papers	Pulverized coal-fired boiler 10.9k papers	Wood gas generator 9,940 papers	Coal gasification 8,893 papers
Bituminous coal 7,732 papers		Bottom ash 7,638 papers

Trends

Notes

History