Structural Slate Company · Structural Slate Company · leaf 105
late in the United States, issued by the U. S. Geological Sur-vey, T. Nelson Dalesays: While nearlyall of the slates ofthe United Statespossess one or twoexcellent features,few possess manysuch features andnone possess themall. Several are soconspicuous fortheir well-nigh per-fect adaptation… … THE STRUCTURAL SLATE COMPANY
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