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Page 6139, results 153451 - 153475

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Limestone aquifers of Maryland
Edmond G. Otton, Claire A. Richardson
1958, Economic Geology (53) 722-736
Limestone rocks are an important source of ground water in the Piedmont and Appalachian areas of Maryland. The major limestone aquifers are the Cockeysville and Wakefield marbles and the Silver Run, Tomstown, Frederick, Grove, Waynesboro, Elbrook, Conococheague, Beekmantown, Stones River, Tonoloway, Helderberg and Greenbrier formations. Drilled and dug wells and...
Titaniferous sedimentary rocks in the Cuyuna district, central Minnesot
R. G. Schmidt
1958, Economic Geology (53) 708-721
The ore-yielding main iron-formation of the Cuyuna district is strati-graphically overlain by approximately 300 feet of titaniferous sedimentary rocks, and a field test for titahia has been an effective supplement to customary stratigraphic studies. The titanium is in leucoxene. The sedimentary rocks of the district are highly folded, and the...
Mass control of insects: The effects on fish and wildlife
Oliver B. Cope, Paul F. Springer
1958, Bulletin of the Entomological Society of America (4) 52-56
The mass control of insects carried on during the past ten years has made possible the economical suppression and, in a few instances, the near eradication of pest insect populations over widespread areas. These large operations, usually featuring the use of the airplane for applying insecticides quickly and cheaply, have...
The thermal regime of an Arctic lake
Max C. Brewer
1958, Eos, Transactions, American Geophysical Union (39) 278-284
Much of the Arctic coastal plain in Alaska is covered by shallow lakes. Those in the Barrow area, which are believed to be representative of most of the lakes in the coastal plain, are generally either two to three feet or six to nine feet deep. The shallow lakes can...
Nickel-gold ore of the mackinaw mine, Snohomish County, Washington
C. Milton, D.J. Milton
1958, Economic Geology (53) 426-447
The Mackinaw mine ore is of an unusual or unique type, consisting chiefly of niccolite, maucherite, pentlandite, chalcopyrite, cubanite, and magnetite in an altered peridotite. Valleriite, gold and sphalerite are minor primary minerals; chalcocite and violarite or bravoite are supergene minerals. Pyrrhotite and pyrite are absent. From the textural relations...
Airborne radioactivity surveys in geologic exploration
R.M. Moxham
1958, Trace Elements Investigations 662
The value of airborne radioactivity surveys in guiding uranium exploration has been well established. Recent improvements in circuitry and development of semiquantitative analytical techniques permit a more comprehensive evaluation of the geologic distribution of radioactive materials that may prove useful in exploration for other minerals and in regional geologic studies....
Suggestions to authors of the reports of the United States Geological Survey
U.S. Geological Survey
1958, Report
Knowledge acquired by the Geological Survey through programs of research and investigations has no value to the public if it remains in office files or in the minds of the scientists and engineers who did the work. The full discharge of the Survey's responsibilities is attained only by making its...
Semimicrodetermination of tantalum with selenous acid
F. S. Grimaldi, M. M. Schnepfe
1958, Analytical Chemistry (30) 2046-2049
Tantalum is separated and determined gravimetrically by precipitation with selenous acid from a highly acidic solution containing oxalic and tartaric acids. The method is selective for the determination of up to 30 mg. of tantalum pentoxide, and tolerates relatively large amounts of scandium, yttrium, cerium, titanium, zirconium, thorium, vanadium, niobium,...