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Page 5437, results 135901 - 135925

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Not all publications have extents, not all extents are completely accurate
Niobium (columbium) and tantalum resources of Brazil
Max Gregg White
1975, Open-File Report 75-29
Most of the niobium resources of Brazil occur as pyrochlore in carbonatites within syenitic intrusives of Late Cretaceous to early Tertiary age in western Minas Gerais and southeastern Goils. Minor amounts of it are produced together with tantalum from columbite-tantalite concentrates from pegmatites and placers adjacent to them, in the...
Formulation and use of practical models for river-quality assessment
Walter G. Hines, D. A. Rickert, S. W. McKenzie, J. P. Bennett
1975, Circular 715-B
For nearly half a century the Willamette River in Oregon experienced severe dissolved-oxygen problems related to large loads of organically rich waste waters from industries and municipalities. Since the mid-1950 's dissolved oxygen quality has gradually improved owing to low-flow augmentation, the achievement of basinwide secondary treatment, and the use...
Water temperature-influential factors, field measurement, and data presentation
Herbert H. Stevens, John F. Ficke, George F. Smoot
1975, Techniques of Water-Resources Investigations 01-D1
This manual contains suggested procedures for collecting and reporting of water-temperature data on streams, lakes and reservoirs, estuaries, and ground water. Among the topics discussed are the selection of equipment and measuring sites, objectives and accuracy of measurements, and data processing and presentation. Background information on the influence...
Landsliding in Allegheny County, Pennsylvania
Reginald Peter Briggs, John S. Pomeroy, William E. Davies
1975, Circular 728
Man should proceed with caution if modifications such as loading, excavation, or changes of the water regime are contemplated for slopes in Allegheny County, especially those slopes described on the map as highly sensitive to disturbance by man. Features indicative of unstable slope conditions include: cracks in buildings, yard walls,...
Mineral resource management of the Outer Continental Shelf : leasing procedures, evaluation of resources, and supervision of production operations on leased lands of the Outer Continental Shelf
Maurice V. Adams, C.B. John, R.F. Kelly, A.E. LaPointe, R.W. Meurer
1975, Circular 720
An important function of the Geological Survey is the evaluation and management of the mineral resources of the Outer Continental Shelf, particularly with respect to oil and gas, salt, and sulfur. Production of oil and gas from the Outer Continental Shelf of the United States has increased substantially over the...
Paleotectonic investigations of the Pennsylvanian system in the United States, Part II: Interpretive summary and special features of the Pennsylvanian system
Edwin D. McKee, Eleanor J. Crosby, John C. Ferm, Walter D. Keller, James M. Schopf, Theodore R. Walker, Harold R. Wanless, Cynthia Roseman Wright
1975, Professional Paper 853-2
Interpretation of the paleotectonic history of the Pennsylvanian System is represented on two sets of maps, one referred to as interpretive isopach maps and the other as interpretive paleotectonic maps (pi. 15A-C). Each set includes five maps, one for each interval of the Pennsylvanian. All maps of both sets were...
The Alaskan mineral resource assessment program; background information to accompany folio of geologic and mineral resource maps of the Nabesna Quadrangle, Alaska
Donald H. Richter, N. R. D. Albert, D.F. Barnes, Andrew Griscom, S.P. Marsh, D.A. Singer
1975, Circular 718
The Nabesna quadrangle in south-central Alaska is the first of the l:250,000-scale Alaskan quadrangles to be investigated by an interdisciplinary research team in order to furnish a mineral resource assessment of the State. The assessment of the 17,600-km 2 16,800-mi21 quadrangle is based on field and laboratory investigations of the...
A practical framework for river-quality assessment
David A. Rickert, Walter G. Hines
1975, Circular 715-A
For nearly half a century the Willamette River in Oregon experienced severe dissolved-oxygen problems related to large loads of organically rich waste waters from industries and municipalities. Since the mid-1950 's dissolved oxygen quality has gradually improved owing to low-flow augmentation, the achievement of basinwide secondary treatment, and the use...
Anomalous concentrations of several metals in iron-formation of the Blue Lead Mountain area, Pennington County, South Dakota
William H. Raymond, Robert Ugstad King, James Jennings Norton
1975, Circular 707
Geochemical sampling of bedrock has revealed anomalous copper, silver, molybdenum, gold, arsenic, mercury, zinc, and cobalt in meta-iron-formation in the Blue Lead Mountain area 5 miles (8 kilometres) north-northwest of Keystone, S. Dak. The anomalies are in complexly folded and faulted iron-formation. Metal content decreases sharply in the surrounding rocks....
The National Stream Quality Accounting Network (NASQAN) - Some questions and answers
John F. Ficke, Richard O. Hawkinson
1975, Circular 719
One of the major new efforts of the U.S. Geological Survey is the National Stream Quality Accounting Network (NASQAN). This circular is intended to answer some of the frequently asked questions concerning concepts used in establishing NASQAN, its purposes, design, value, and future plans....