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Use of GIS to Identify and Delineate Areas of Fluoride, Sulfate, Chloride, and Nitrate Levels in the Woodbine Aquifer, North Central Texas, in the 1950s, 1960s, 1970s, 1980s, and 1990s (open access)

Use of GIS to Identify and Delineate Areas of Fluoride, Sulfate, Chloride, and Nitrate Levels in the Woodbine Aquifer, North Central Texas, in the 1950s, 1960s, 1970s, 1980s, and 1990s

ArcView and ArcInfo were used to identify and delineate areas contaminated by fluoride, sulfate, chloride, and nitrate in the Woodbine Aquifer. Water analysis data were obtained from the TWDB from the 1950s to 1990s covering 9 counties. 1990s land use data were obtained to determine the relationship with each contaminant. Spearman's rank correlation coefficients and Kruskal-Wallis tests were used to calculate relationships between variables. Land uses had little effect on distributions of contaminants. Sulfate and fluoride levels were most problematic in the aquifer. Depth and lithology controlled the distributions of each contaminant. Nitrate patterns were controlled mainly by land use rather than geology, but were below the maximum contaminant level. In general, contaminant concentrations have decreased since the 1950s.
Date: August 2001
Creator: Sanmanee, Sirichai
System: The UNT Digital Library

Southland, The Completion Of a Dream: The Story Behind Southern Newsprint's Improbable Beginnings

Access: Use of this item is restricted to the UNT Community
The purpose of this thesis is to explore the creative process behind Southland Paper Mills, the South's first newsprint factory. The thesis describes the conditions leading to the need for southern newsprint. It then chronicles, through the use of company records, the difficult challenges southern newsprint pioneers faced. The thesis follows the company history from the gem of an idea during the mid 1930's through the first decade of the Southland's existence. The paper concludes with the formative years of the company in the 1940's.
Date: May 2001
Creator: McGrath, Charles
System: The UNT Digital Library