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2. Occurrence and distribution of algal biomass and its relation to nutrients and selected basin characteristics in Indiana streams, 2001-2005
3. Occurrence and distribution of fecal indicator bacteria, and physical and chemical indicators of water quality in streams receiving discharge from Dallas/Fort Worth International Airport and vicinity, north-central Texas, 2008
4. Occurrence and distribution of organic chemicals and nutrients and comparison of water-quality data from public drinking-water supplies in the Columbia Aquifer in Delaware, 2000-08
5. Occurrence and hydrogeochemistry of radiochemical constituents in groundwater of Jefferson County and surrounding areas, Southwestern Montana, 2007 through 2010
6. Occurrence and sources of Escherichia coli in metropolitan St. Louis streams, October 2004 through September 2007
7. Occurrence and transport of selected constituents in streams near the Stibnite mining area, Central Idaho, 2012-14
8. Occurrence and trends in the concentrations of fecal-indicator bacteria and the relation to field water-quality parameters in the Allegheny, Monongahela, and Ohio Rivers and selected tributaries, Allegheny County, Pennsylvania, 2001-09
9. Occurrence, distribution, and trends of volatile organic compounds in the Ohio River and its major tributaries, 1987-96
10. Occurrence, fate, and transport of aerially applied herbicides to control invasive buffelgrass within Saguaro National Park Rincon Mountain District, Arizona, 2015--18
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