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Air filtration

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

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Biology 35.4M papers	Physics 32.1M papers	Chemistry 28.8M papers	Engineering 24.4M papers
Organic chemistry 13M papers	Geography 11.3M papers	Ecology 7.9M papers	Environmental science 7.9M papers
Meteorology 2.6M papers		Environmental engineering 965k papers
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Air filtration 1,563 papers
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