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*[https://web.archive.org/web/20140728125404/http://dnr.louisiana.gov/assets/docs/oilgas/productiondata/comments_1989_rev.pdf Comments on API gravity adjustment scale]
*[http://www.globalsecurity.org/military/library/policy/army/fm/10-67-1/APPI.HTML Instructions for using a glass hydrometer measured in API gravity]
*[https://engineeringunits.com/api-gravity-calculator/ API Gravity Calculator]
[[Category:Units of density]]
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