Coalbed methane

https://www.wikidata.org/wiki/Q955546

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	Coal 270k papers
Coal mining 87.6k papers
Current
Coalbed methane 7,083 papers
Child

Trends

Notes

History