BOOKQUE

The Hospitallers, Templars, and Teutonic Knights in the Morea After the Fourth Crusade
Erhard P. Opsahl
· 1994
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Detections, Concentrations, and Distributional Patterns of Compounds of Emerging Concern in the San Antonio River Basin, Texas, 2011-2012
Stephen P. Opsahl , Rebecca B. Lambert , Geological Survey (U.S.) Staff , San Antonio River Authority Staff
· 2013
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Science to support the understanding of south Texas surface-water and groundwater resources in a changing landscape
Darwin J. Ockerman
· 2012
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Water-quality Observations of the San Antonio Segment of the Edwards Aquifer, Texas, with an Emphasis on Processes Influencing Nutrient and Pesticide Geochemistry and Factors Affecting Aquifer Vulnerability, 2010-16
Stephen P. Opsahl
· 2018
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Effects of Urbanization on Water Quality in the Edwards Aquifer, San Antonio and Bexar County, Texas
Stephen P. Opsahl , MaryLynn Musgrove , Keith E. Mecum
· 2020
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Concentrations of Selected Constituents in Surface-water and Streambed-sediment Samples Collected from Streams in and Near an Area of Oil and Natural-gas Development, South-central Texas, 2011-13
Stephen P. Opsahl , Cassi L. Crow
· 2015
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Prospects of a 500,000 Person Army National Guard by 1990
Erhard P. Opsahl , National War College (U.S.)
· 1985
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Quality of Surface-water Runoff in Selected Streams in the San Antonio Segment of the Edwards Aquifer Recharge Zone, Bexar County, Texas, 1997-2012
Stephen P. Opsahl
· 2012
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Land-cover Changes Associated with Oil and Natural-gas Production and Concentrations of Selected Constituents in Surface-water and Streambed-sediment Samples Collected Upstream from and Within an Area of Oil and Natural-gas Production, South Texas, 2008-17
Cassi L. Crow , Stephen P. Opsahl , Diana E. Pedraza , Emily C. Pease , Ross K. Kushnereit
· 2018
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Temporal and Spatial Variability of Water Quality in the San Antonio Segment of the Edwards Aquifer Recharge Zone, Texas, with an Emphasis on Periods of Groundwater Recharge, September 2017–July 2019
Stephen P. Opsahl , MaryLynn Musgrove , Keith E. Mecum
· 2020