Barely Significant
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Study of the Impact of Coals and Claystones on Wear-Resistant Steels.

Materials (Basel) · 2023 · PMC10051981 · PMID 36984016

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quite significantno p-value reported
The claystones used during this study contained quite significant amounts of coal matter, which was present in a dispersed form (as pigment), explaining the dark grey colour of the rock.

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