Search datasets
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Data quality assurance and quality control are critical to the effective conduct of a clinical trial. In the present commentary, we discuss our experience in a large, multicenter stroke trial. In...
Search relevance: 155.30 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 07:54 PM -
This data record contains questions and responses to a USGS-wide survey conducted to identify issues and needs associated with quality assurance and quality control (QA/QC) of USGS timeseries data...
Search relevance: 151.97 | Views last month: 2 | Catalog Last Checked: September 10, 2026 at 08:35 PM -
These data contain concentrations of major and trace elements in quality-assurance samples.These are the machine-readable versions of Tables 2–5 from the U.S. Geological Survey Scientific...
Search relevance: 146.06 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 09:19 PM -
This dataset includes data quality assurance information concerning the Relative Percent Difference (RPD) of laboratory duplicates. No laboratory duplicate information exists for 2010. The...
Search relevance: 136.74 | Views last month: 2 | Catalog Last Checked: September 10, 2026 at 09:01 PM -
In June and July of 2020, 45 groundwater wells in McHenry County, Illinois, were sampled for water quality (field properties, major ions, nutrients, and trace metals) and 12 wells were sampled for...
Search relevance: 124.04 | Views last month: 2 | Catalog Last Checked: September 10, 2026 at 08:54 PM -
This report evaluates laboratory measurements of suspended-sediment concentrations, total sediment mass, grain-size separation, and fine particle-size distributions for performance-testing samples...
Search relevance: 122.56 | Views last month: 0 | Catalog Last Checked: September 10, 2026 at 09:27 PM -
The National Atmospheric Deposition Program/National Trends Network (NADP/NTN) was initiated in 1978 by the Association of State Agricultural Experiment Stations to monitor long-term atmospheric...
Search relevance: 118.02 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 08:53 PM -
The USGS Precipitation Chemistry Quality Assurance Project (PCQA) operates QA programs to challenge and test the National Atmospheric Deposition Program (NADP) data-collection processes for both...
Search relevance: 116.86 | Views last month: 3 | Catalog Last Checked: September 10, 2026 at 08:17 PM -
This data release contains field and geochemical data, discharge measurements, and descriptive observations for 261 springs in eastern Oregon and northern Nevada. Data were collected during water...
Search relevance: 116.42 | Views last month: 0 | Catalog Last Checked: September 10, 2026 at 08:16 PM -
The USGS Precipitation Chemistry Quality Assurance Project (PCQA) operates QA programs to challenge and test the National Atmospheric Deposition Program (NADP) data-collection processes for both...
Search relevance: 116.08 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 08:49 PM -
The USGS Precipitation Chemistry Quality Assurance Project (PCQA) operates QA programs to challenge and test the National Atmospheric Deposition Program (NADP) data-collection processes for both...
Search relevance: 108.82 | Views last month: 3 | Catalog Last Checked: September 10, 2026 at 10:38 PM -
This dataset contains the lithologic class and topographic position index information and quality-assurance and quality-control data not available in the online National Water Information System...
Search relevance: 108.17 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 09:46 PM -
This dataset contains replicate samples collected in the field by community technicians. No field replicates were collected in 2012. Replicate constituents with differences less than 10 percent...
Search relevance: 102.50 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 08:21 PM -
This dataset includes laboratory instrument detection limit data associated with laboratory instruments used in the analysis of surface water samples collected as part of the USGS - Yukon River...
Search relevance: 102.03 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 07:53 PM -
Sugar Creek Lake is located approximately 4 miles northwest of Moberly, Missouri, in Randolph County, and has a full-pool surface area of approximately 330 acres. The lake primarily is used for...
Search relevance: 99.72 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 07:55 PM -
Beaver Lake was constructed in 1966 on the White River in the northwest corner of Arkansas for flood control, hydroelectric power, public water supply, and recreation. The surface area of Beaver...
Search relevance: 98.79 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 08:05 PM -
This data release provides data in support of an assessment of water quality and discharge in the Herring River at the Chequessett Neck Road dike in Wellfleet, Massachusetts, from November 2015 to...
Search relevance: 96.51 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 10:38 PM -
No description found
Search relevance: 88.31 | Views last month: 2 | Catalog Last Checked: September 10, 2026 at 07:59 PM -
The U.S. Geological Survey (USGS), in cooperation with the U.S. Fish and Wildlife Service (USFWS) and St. Cloud State University (SCSU), identified the occurrence of chemicals of emerging concern...
Search relevance: 87.55 | Views last month: 4 | Catalog Last Checked: September 10, 2026 at 08:11 PM -
The U.S. Geological Survey (USGS), in cooperation with the U.S. Fish and Wildlife Service (USFWS) and the U.S. Environmental Protection Agency (EPA), identified the occurrence of contaminants of...
Search relevance: 87.35 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 10:15 PM
