Tennis ball

https://www.wikidata.org/wiki/Q246514

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Chemistry 28.4M papers	Engineering 23.9M papers	Materials science 18.2M papers	Organic chemistry 12.8M papers
Mechanical engineering 5.3M papers	Metallurgy 4.7M papers	Shot (pellet) 26.6k papers	sports equipment 1,858 papers
Current
Tennis ball 1,162 papers
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