941 resultados para Montana Bureau of Mines and Geology


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Title varies slightly

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"This draft report represents five years of work by the National Water Commission studying all the nation's water problems and needs."

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Agreed-upon procedures reports on twelve agreements between the Bureau of Nutrition and Health Services of the Iowa Department of Education and child care centers for the period October 1, 2014 through September 30, 2015

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Bulletin of isotopic geochronology.

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GeoRef

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Mode of access: Internet.

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The laboratory model is considered in this thesis. Information gained from this investigation has not been trans­ferred to the larger industrial machines. Some of the factors noted concerning the efficiency of the laboratory shaking table are inherent in this small scale model only.

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The smelting of complex lead ores is a difficult operation, especially when they contain considerable amounts of iron and zinc. When these ores are smelted, all of the zinc, which is valuable and well worth recovering, goes into the slag. With the advent of the flotation processes, and the ability of these processes to concentrate the lead and zinc minerals into separate products, the smelting of complex lead ores was to a great extent simplified.

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First vol. (through 1950) compiled by M.R. Burks and J.H. Schilling; 1951-55 and 1956-60 by C.F. and J.H. Schilling: 1961-65 by T. Ray; 1966-70 by M.A. and H.H. Koehn; 1971-75 by J.R. Wright and J.A. Russell; 1976-80 by Dana M. Adkins-Heljeson and Candace L. Holts.

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Report period ends Nov. 30.

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Chiefly tables.

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First-third reports, 1915/16-1917/18, issued as California State Mining Bureau Bulletin no. 73, 82, 84.

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"Prepared by the United States Geological Survey in collaboration with the Washington State Department of Conservation, Division of Mines and Geology, and the United States Bureau of Reclamation, and other agencies, at the request of Senator Henry M. Jackson, chairman of the Committee on Interior and Insular Affairs, United States Senate."