Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 233
PLATE XIII. … The Slate Regions ok Pennsylvania. (After Prof. Mansfield Merriman.) To/ace /age 193. THE ARGILLITES: SLATES. 193 large amounts of waste in the preparation of material forroofing, inasmuch as only those portions of uniform textureand composition lying between the ribbons are suitable for…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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