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2. Seasonal changes in phytoplankton populations and related chemical and physical characteristics in lakes in Loch Vale, Rocky Mountain National Park, Colorado
3. Sediment accumulation in San Leandro Bay, Alameda County, California, during the 20th century : a preliminary report
4. Sediment discharge in the Colorado River near De Beque, Colorado
5. Sediment-data sources and estimated annual suspended-sediment loads of rivers and streams in Colorado
6. Seismic-refraction study of suspected drift-filled bedrock valleys in Ramsey County, Minnesota
7. Selected hydrographs and statistical analyses characterizing the water resources of the Arkansas River Basin, Colorado
8. Selenium concentrations in leaf material from Astragalus Oxyphysus (diablo locoweed) and Atriplex Lentiformis (quail bush) in the interior Coast Ranges and the western San Joaquin Valley, California
9. Sensitivity of stream basins in Shenandoah National Park to acid deposition
10. Shallow ground-water conditions, Tom Green County, Texas
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