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Well drainage

https://www.wikidata.org/wiki/Q1047540

Field Hierarchy

Parent
Biology 36M papers	Engineering 24.9M papers	Geology 9.5M papers	Environmental science 8.1M papers
Ecology 8.1M papers	Oceanography 2.5M papers	Geotechnical engineering 2.1M papers	Soil science 791k papers
Soil water 771k papers		Groundwater 247k papers
Current
Well drainage 793 papers
Child

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History