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Continental-Scale Increase in Lake and Steam Phosphorus: Are Oligotrophic Systems Disappearing in the United States?
This article describes continental-scale increases in lake and steam total phosphorus (TP) concentrations, identified through periodic probability surveys of thousands of water bodies in the conterminous United States.
Date:
February 25, 2016
Creator:
Stoddard, John L.; Sickle, John Van; Herlihy, Alan T.; Paulsen, Steven; Brahney, Janice; Pollard, Amina I. et al.
System:
The UNT Digital Library
Older Women Workers and Economic Security
A fact sheet discussing the economic needs of older women, their sources of income, and the gender wage gap by race and ethnicity.
Date:
February 2015
Creator:
United States. Women's Bureau.
System:
The UNT Digital Library