Chalk: A biological limestone formed from shell debris
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What is a chalk line? - Wonkee Donkee Tools
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The CIRIA Chalk description and classification scheme | Semantic Scholar
Chalk - Pink Leisurewear
Chalk | Properties, Composition, Formation and Uses
Chalk - Designing Buildings
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Chalk - Wikipedia
The engineering description of chalk: its strength, hardness and density | Quarterly Journal of Engineering Geology and Hydrogeology
Definition & Meaning of "Chalk" | LanGeek
Grades of chalk at Mundford | Download Table
Chalk - Wikipedia
Chalk – Geology is the Way
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Miscellaneous Chalk - Thomas Graham
White Anti-Dust Chalk - Pk144 - Forward Products
Geological Society - Chalk scenery, Yorkshire
Chalk - Wikipedia
