Air filtration

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

Field Hierarchy

Parent
Biology 36.8M papers	Physics 33.7M papers	Chemistry 29.5M papers	Engineering 25.7M papers
Geography 13.4M papers	Organic chemistry 13.2M papers	Environmental science 9M papers	Ecology 8.3M papers
Meteorology 2.9M papers		Environmental engineering 997k papers
Current
Air filtration 1,580 papers
Child
Minimum efficiency reporting value 0 papers

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History