Coal mining

https://www.wikidata.org/wiki/Q12880211

Field Hierarchy

Parent
Chemistry 29.1M papers	Engineering 24.7M papers	Organic chemistry 13.1M papers	Geography 11.5M papers
History 7.1M papers	Archaeology 6.5M papers	Waste management 1.6M papers	Coal 276k papers
Current
Coal mining 89.7k papers
Child
Coalbed methane 7,256 papers	Groundwater-related subsidence 4,494 papers	Underground mining (soft rock) 3,878 papers	Surface mining 3,657 papers
Longwall mining 3,560 papers	Mine safety 3,428 papers	Rock burst 2,099 papers	Coal basin 1,735 papers
Coal field 1,541 papers		Problems in coal mining 1,395 papers

Trends

Notes

History