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. Author manuscript; available in PMC: 2009 Sep 17.
Published in final edited form as: Environ Sci Technol. 2006 May 15;40(10):3168–3173. doi: 10.1021/es052426p

Figure 1.

Figure 1

Eastern Iowa Study Area. The four major watersheds include the Wapsipinicon (pink), the Cedar (pale yellow), the Iowa (blue) and the Skunk (light green). The monitoring stations are shown by stars and urban areas are shown in bright yellow.