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Line 1: + + − − [[File:Wentworth-Grain-Size-Chart.pdf.jpg|thumb|{{figure number|1}}Wentworth grain size chart from United States Geological Survey Open-File Report 2006-1195]]
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[[File:Wentworth-Grain-Size-Chart.pdf.jpg|thumb|{{figure number|1}}Wentworth grain size chart from United States Geological Survey Open-File Report 2006-1195]]
A number of scales for grain size have been used. One of the commonest in the US is the Wentworth scale.
A number of scales for grain size have been used. One of the commonest in the US is the Wentworth scale.