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Geology of the Plumtree area, Spruce Pine district, North Carolina
Donald Albert Brobst
1953, Open-File Report 53-26
This report describes the results of study and geologic mapping (1:12,000) in the 70-square-mile Plumtree area in the northeastern part of the Spruce Pine pegmatite district, on the Blue Ridge upland in western North Carolina. The district has been the chief domestic source of feldspar and sheet mica. The mining...
Water, frost, and frost resistance of natural and artificial building stones
H. Breyer, S. H. Britt (translator)
1953, Open-File Report 54-33
The worst enemy of construction engineering and of construction material is uncontrollable water, whether it be ground-, seepage-, rainwater, water of condensation, or melting snow and ice, exerting objectionable pressure upon tracks and roads. this applies as well to structures above the ground as to bridge piers and foundations, road...