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| The public Archive of Canada - Trenches in chalk country typical of Vimy and the Somme. In these areas the sub-soil was white chalk. |
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| The public Archive of Canada - Trenches in chalk country typical of Vimy and the Somme. In these areas the sub-soil was white chalk. |
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| The public Archive of Canada - A typical trench scene. |
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| The public Archive of Canada - A trench system near Arras. Note the white chalk. |