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Pegmatites of the Middletown area, Connecticut
Frederick Stugard Jr.
1955, Open-File Report 55-177
The pegmatites of the Middletown area in Connecticut have been mined almost continuously for feldspar and muscovite mica since about 1865, Pegmatites in this and other areas have recently become the subject of renewed interest because pegmatites are the potential source of beryl, the ore mineral of beryllium. During 1948...
Water levels in observation wells in part of Montana, 1946-1953
F. A. Swenson
1955, Open-File Report 55-180
Ground-water investigations were made by the Ground Water Branch, U. S. Geological Survey, from 1946 to 1954, inclusive, in several parts of Montana. These studies were made as part of the program of the Department of the Interior for development of the Missouri River Basin. Thus, the areas selected for...