2. Number of National Stream Quality Accounting Network stations using monthly, bimonthly, and quarterly sampling frequencies by water year, 1973-95
3. Total annual expenditures for National Stream Quality Accounting Network and HBN by water year, 1973-95
4. Number of National Stream Quality Accounting Network stations by water year, 1973-95
5. Number of National Stream Quality Accounting Network water-quality analyses by water year, 1973-95
6. Number of Hydrologic Benchmark Network stations by water year, 1962-95
7. Number of Hydrologic Benchmark Network water-quality analyses by water year, 1962-95
8. Number of standard deviations from the most probable value for Blind Sample Program measurements of sulfate, 1989-91
2. Water properties and approximate sampling frequencies for National Stream Quality Accounting Network and Hydrologic Benchmark Network water-quality data on CD-ROM.
3. National Stream Quality Accounting Network and Hydrologic Benchmark Network time periods of sample collection for bimonthly and quarterly sampling frequencies.
4. Important changes in National Stream Quality Accounting Network and Hydrologic Benchmark Network field methods, constituent coverage, and field sample contamination from 1973-95
5. U.S. Geological Survey memoranda describing National Stream Quality Accounting Network and Hydrologic Benchmark Network protocols and changes in network field and laboratory methods.
6. Applicable dates and parameter/method codes used to compile National Stream Quality Accounting Network and Hydrologic Benchmark Network alkalinity, bicarbonate, and carbonate data on CD-ROM
7. Explanation of total constituent analyses performed on National Stream Quality Accounting Network and Hydrologic Benchmark Network water-quality samples
8. Important changes in U.S. Geological Survey water-quality laboratory analytical methods, reporting conventions, and laboratory sample contamination from 1970-95
9. Blind Sample Program parameters and National Water Quality Laboratory analytical method codes selected for publication on CD-ROM for water years 1985-95
