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Trace Elements Investigations : The Occurrence of Columbium and Tantalum
The following report is the fourth in a series of reports on rare and uncommon elements prepared by the Geological Survey. This report covers columbius and tantalus, two chemical elements belonging to the fifth group of the periodic table and quinquevalent in most of their compounds.
Date:
August 8, 1983
Creator:
Fleischer, Michael & Harder, James O.
System:
The UNT Digital Library
Preliminary Report on Methods of Analysis for very Small Percentages of Uranium
Abstract: Procedures are presented in detail of two methods for the determination of very small percentages or uranium (down to 0.0025). The methods are applicable to a wide variety of materials. Notes on the methods and confirmatory experiments are also given.
Date:
August 8, 1983
Creator:
Foster, H. D.; Grimaldi, F. S. & Stevens, R. M.
System:
The UNT Digital Library
Evaluation of the San Dieguito, San Elijo, and San Pasqual Hydrologic Subareas for Reclaimed Water Use, San Diego County, California
From purpose and scope: The purpose of this study was to update hydrologic data and refine understanding of the hydrologic system within the San Dieguito, San Elijo, and San Pasqual hydrologic subareas in San Diego County, Calif., and to evaluate the suitability of these areas for reclaimed water use.
Date:
August 1983
Creator:
Izbicki, John A.
System:
The UNT Digital Library