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Publication Extents

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A magnetic anomaly near Bear Lake, Houghton County, Michigan
James C. Wright
1952, Open-File Report 52-169
A large magnetic anomaly of unknown origin occurs about 1 1/2 miles east of Bear Lake, Houghton County, Michigan, in secs. 24 and 258 T. 56 N., R. 34 W. The occurrence is isolated in an area of very weakly magnetic rocks and has special geologic interest because it is...
Manganese, iron, and barite deposits of the James River-Roanoke River district, Virginia
Gilbert H. Espenshade
1952, Miscellaneous Field Studies Map 5
During the period 1940-1942 the United States Geological Survey made a geologic study of the manganese deposits of the James River-Roanoke River district, in the general vicinity of Lynchburg, Va. (fig. 1), as part of its program of strategic minerals investigations.  This work was done by the writer and supervised...
Phosphate deposits of the Concepcion del Oro district, Zacatecas, Mexico
Cleaves Lincoln Rogers, Salvador Ulloa, Eugenio Tavera
1952, Open-File Report 52-131
The two small Mexican plants that are currently producing acid-phosphate fertilizer from phosphate rock have a productive capacity of about 45,000 metric tons annually. The larger plant processes pebble phosphate imported from Florida, while the other is utilizing material from the small, widely scattered phosphate deposits of Nuevo Leon. Large-scale...
Topographic instructions, Book 3, multiplex procedure; Chapter 3 C7a-e
Edward I. Loud
1952, Circular 164
By direct projection of overlapping photographs, printed on glass plates, the multiplex produces an exact optical model, in miniature, of the terrain to be mapped. To create the model, the multiplex projectors must be properly positioned and oriented so that they duplicate the orientation of the aerial camera at the...