Resource Type
Partner
Oklahoma Historical Society
25
UNT Libraries Government Documents Department
21
South Plains College
6
Gladys Johnson Ritchie Library
5
Sterling Municipal Library
5
Allen Public Library
4
Hopkins County Genealogical Society
4
Atlanta Public Library
3
Dublin Public Library
3
Gaines County Library
3
29 More
Collection
Texas Digital Newspaper Program
77
Tocker Foundation Grant
52
Oklahoma Digital Newspaper Program
26
Office of Scientific & Technical Information Technical Reports
13
Hockley County Area Newspaper Collection
6
The Baytown Sun
5
The Jack County Newspaper Collection
5
The Allen American
4
Hopkins County Area Newspapers
4
Sapulpa Herald
4
42 More
Country
States
Year
Month
Language
125 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 24 of
125
next
Royalty Management Program's Auditing and Financial System: Technical Issues
A report on royalty, rental, and bonus payments from non-fuel mineral leases on public lands are a oil and gas and other fuel and major source of income for the Federal government, States, and Indian Tribes.
Date:
July 1990
Creator:
United States. Congress. Office of Technology Assessment.
Object Type:
Report
System:
The UNT Digital Library
The extraction of bitumen from western tar sands. Annual report
Topics discussed include: characterization of bitumen impregnated sandstone, water based tar sand separation technology, electrophoretic characterization of bitumen and fine mineral particles, bitumen and tar sand slurry viscosity, the hot water digestion-flotation process, electric field use on breaking water-in-oil emulsions, upgrading of bitumens and bitumen-derived liquids, solvent extraction.
Date:
July 1990
Creator:
Oblad, A. G.; Bunger, J. W.; Deo, M. D.; Hanson, F. V.; Miller, J. D. & Seader, J. D.
Object Type:
Report
System:
The UNT Digital Library
The extraction of bitumen from western tar sands
Topics discussed include: characterization of bitumen impregnated sandstone, water based tar sand separation technology, electrophoretic characterization of bitumen and fine mineral particles, bitumen and tar sand slurry viscosity, the hot water digestion-flotation process, electric field use on breaking water-in-oil emulsions, upgrading of bitumens and bitumen-derived liquids, solvent extraction.
Date:
July 1, 1990
Creator:
Oblad, A. G.; Bunger, J. W.; Deo, M. D.; Hanson, F. V.; Miller, J. D. & Seader, J. D.
Object Type:
Report
System:
The UNT Digital Library
Reactive Chemical Transport in Ground-Water Hydrology: Challenges to Mathematical Modeling
For a long time, earth scientists have qualitatively recognized that mineral assemblages in soils and rocks conform to established principles of chemistry. In the early 1960's geochemists began systematizing this knowledge by developing quantitative thermodynamic models based on equilibrium considerations. These models have since been coupled with advective-dispersive-diffusive transport models, already developed by ground-water hydrologists. Spurred by a need for handling difficult environmental issues related to ground-water contamination, these models are being improved, refined and applied to realistic problems of interest. There is little doubt that these models will play an important role in solving important problems of engineering as well as science over the coming years. Even as these models are being used practically, there is scope for their improvement and many challenges lie ahead. In addition to improving the conceptual basis of the governing equations, much remains to be done to incorporate kinetic processes and biological mediation into extant chemical equilibrium models. Much also remains to be learned about the limits to which model predictability can be reasonably taken. The purpose of this paper is to broadly assess the current status of knowledge in modeling reactive chemical transport and to identify the challenges that lie ahead.
Date:
July 1, 1990
Creator:
Narasimhan, T. N. & Apps, J. A.
Object Type:
Article
System:
The UNT Digital Library
Selenium speciation in ground water. Quarterly report
Selenium toxicity diseases in animals may occur when the intake exceeds 4 mg/kg and selenium deficiency symptoms may occur when dietary intake is less than 0.04 mg/kg. Since the selenium dietary requirement is very close to toxic concentration, it is important to understand the distribution of selenium in the environment. Selenium occurs in four oxidation states (-II, 0, +IV, and +VI) as selenide, elemental selenium, selenite and selenate. Selenate is reported as more soluble and less adsorbed than selenite. Selenate is more easily leached from soils and is the most available form for plants. Increased mobility of Se into the environment via anthropogenic activities, and the potential oxidation-reduction behavior of the element have made it imperative to study the aquatic chemistry of Se. For this purpose, Se species are divided into two different categories: dissolved Se (in material that passes through filters with 0.45 u openings) and particulate Se (in material of particle size > 0.45 mm) typically suspended sediment and other suspended solids. Element and colloidal phase, not truly dissolved, but passing through the filter is deemed to consist of selenium (-2,0). In dissolved state selenium may exist in three of its four oxidation states; Se(-II), Se(+IV), and Se(+VI). …
Date:
July 10, 1990
Creator:
Atalay, A.
Object Type:
Report
System:
The UNT Digital Library
Selenium speciation in ground water
Selenium toxicity diseases in animals may occur when the intake exceeds 4 mg/kg and selenium deficiency symptoms may occur when dietary intake is less than 0.04 mg/kg. Since the selenium dietary requirement is very close to toxic concentration, it is important to understand the distribution of selenium in the environment. Selenium occurs in four oxidation states (-II, 0, +IV, and +VI) as selenide, elemental selenium, selenite and selenate. Selenate is reported as more soluble and less adsorbed than selenite. Selenate is more easily leached from soils and is the most available form for plants. Increased mobility of Se into the environment via anthropogenic activities, and the potential oxidation-reduction behavior of the element have made it imperative to study the aquatic chemistry of Se. For this purpose, Se species are divided into two different categories: dissolved Se (in material that passes through filters with 0.45 u openings) and particulate Se (in material of particle size > 0.45 mm) typically suspended sediment and other suspended solids. Element and colloidal phase, not truly dissolved, but passing through the filter is deemed to consist of selenium (-2,0). In dissolved state selenium may exist in three of its four oxidation states; Se(-II), Se(+IV), and Se(+VI). …
Date:
July 10, 1990
Creator:
Atalay, A.
Object Type:
Report
System:
The UNT Digital Library
Slipstream, Volume 28, Number 7, July 1990
Monthly magazine published by the Maverick Region of the Porsche Club of America containing stories related to the organization or of interest to the group's members including news, upcoming and past events, other feature articles, and classified advertisements.
Date:
July 1990
Creator:
Porsche Club of America. Maverick Region.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 110, No. 9, Ed. 1 Monday, July 2, 1990
Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 2, 1990
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 110, No. 13, Ed. 1 Monday, July 30, 1990
Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 30, 1990
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Sulphur Springs News-Telegram (Sulphur Springs, Tex.), Vol. 112, No. 179, Ed. 1 Monday, July 30, 1990
Daily newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
July 30, 1990
Creator:
Keys, Clarke
Object Type:
Newspaper
System:
The Portal to Texas History
Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 110, No. 11, Ed. 1 Monday, July 16, 1990
Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 16, 1990
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 115, No. 4, Ed. 1 Thursday, July 5, 1990
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
July 5, 1990
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
Dublin Progress (Dublin, Tex.), Vol. 103, No. 5, Ed. 1 Thursday, July 12, 1990
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 12, 1990
Creator:
Burch, Sonja
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 29, Ed. 1 Thursday, July 19, 1990
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
July 19, 1990
Creator:
Lobpries, F. Mike & Lobpries, Fran
Object Type:
Newspaper
System:
The Portal to Texas History
Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 110, No. 12, Ed. 1 Monday, July 23, 1990
Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 23, 1990
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Transit Statistics: 1989
Annual compilation of tabulated data regarding public transit and other transportation in the state of Texas.
Date:
July 1990
Creator:
Texas. Division of Public Transportation.
Object Type:
Report
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 108, No. 52, Ed. 1 Sunday, July 1, 1990
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
July 1, 1990
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 101, No. 4, Ed. 1 Thursday, July 19, 1990
Weekly newspaper from De Leon, Texas that includes local, state, and national news along with advertising.
Date:
July 19, 1990
Creator:
Wilkerson, Gayle E.
Object Type:
Newspaper
System:
The Portal to Texas History
Stamford American (Stamford, Tex.), Vol. 69, No. 14, Ed. 1 Thursday, July 5, 1990
Weekly newspaper from Stamford, Texas that includes local, state, and national news along with advertising.
Date:
July 5, 1990
Creator:
Craig, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
The Paducah Post (Paducah, Tex.), Vol. 84, No. 22, Ed. 1 Wednesday, July 18, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
July 18, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Parks & Wildlife, Volume 48, Number 7, July 1990
Magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
July 1990
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Paducah Post (Paducah, Tex.), Vol. 84, No. 21, Ed. 1 Wednesday, July 11, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
July 11, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
Sulphur Springs News-Telegram (Sulphur Springs, Tex.), Vol. 112, No. 164, Ed. 1 Thursday, July 12, 1990
Daily newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
July 12, 1990
Creator:
Keys, Clarke
Object Type:
Newspaper
System:
The Portal to Texas History
Dublin Progress (Dublin, Tex.), Vol. 103, No. 6, Ed. 1 Thursday, July 19, 1990
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 19, 1990
Creator:
Burch, Sonja
Object Type:
Newspaper
System:
The Portal to Texas History