Middle level

https://www.wikidata.org/wiki/Q6841486

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Physics 33.5M papers	Chemistry 29.4M papers	Engineering 25.5M papers	Quantum mechanics 13.5M papers
Mechanical engineering 5.6M papers	Thermodynamics 5.1M papers	Physical chemistry 3.1M papers	Work (physics) 1.6M papers
Polarization (electrochemistry) 311k papers
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Middle level 3,653 papers
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