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tm4a3.pdf - Statistical Methods in Water Resources
Cover: Top Left: A loess smooth curve of dissolved nitrate plus nitrite concentration as a function of discharge, Iowa River, at Wapello, Iowa, water years 1990–2008 for the months of June, July, August, and September. Top Right: U.S. Geological Survey scientists Frank Engel (left) and Aaron Walsh (right) sample suspended
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