Publisher's Synopsis
Excerpt from The Architect, Engineer, and Operative Builder's Constructive Manual
The county of Northumberland contains, 1. M oun tain or carboniferous limestone. 2. Coal. 3. Basaltic and porphyritic trap. And, 4. Old red sandstone, with the accompanying beds of conglomerates, grit stones, variegated marls, and cornstones.
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