Imperial units - Wikipedia
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Weights and Measures Acts (UK) - Wikipedia
Stone (unit) - Wikipedia
A Bit on the History of The British Imperial System of Weights and Measures
This map shows the countries not using the metric system. Are you surprised?
How does the imperial system work? - Quora
Gallon - Wikipedia
To what extent does the UK still use Imperial units? How pervasive are they in British culture? - Quora
The fact that the US gets so much flak for using imperial units, yet this still flies over seas. : r/mildlyinfuriating
Avoirdupois - Wikipedia
United States customary units - Wikipedia