API gravity

https://www.wikidata.org/wiki/Q29246

Field Hierarchy

Parent
Biology 36M papers	Chemistry 28.9M papers	Engineering 25M papers	Organic chemistry 12.9M papers
Geology 10.4M papers	Paleontology 5.5M papers	Petroleum engineering 498k papers	Petroleum 98.9k papers
Crude oil 26.9k papers
Current
API gravity 984 papers
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History