Coal water

https://www.wikidata.org/wiki/Q1996954

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Parent
Physics 31.7M papers	Chemistry 28.4M papers	Engineering 23.9M papers	Materials science 18.2M papers
Organic chemistry 12.8M papers	Geography 11.1M papers	Composite material 8.6M papers	Environmental science 7.7M papers
History 7M papers		Archaeology 6.3M papers
Current
Coal water 1,814 papers
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History