Air filtration

https://www.wikidata.org/wiki/Q583488

Field Hierarchy

Parent
Biology 34.8M papers	Physics 31.7M papers	Chemistry 28.4M papers	Engineering 23.9M papers
Organic chemistry 12.8M papers	Geography 11.1M papers	Ecology 7.8M papers	Environmental science 7.7M papers
Meteorology 2.6M papers		Environmental engineering 949k papers
Current
Air filtration 1,500 papers
Child

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History