Catalytic converter

https://www.wikidata.org/wiki/Q653807

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Biology 34.8M papers	Physics 31.7M papers	Chemistry 28.4M papers	Engineering 23.9M papers
Biochemistry 13.3M papers	Organic chemistry 12.8M papers	Mechanical engineering 5.3M papers	Thermodynamics 5M papers
Catalysis 3M papers		Waste management 1.5M papers
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Catalytic converter 1,931 papers
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