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<br /> VARIATION
<br />1 MAXIMUM OIlSERVEo
<br />CON CENTRA TION COMPUTED BY PIONEER-I
<br /> MODEL
<br />AVERAGE OIlSERVEo
<br />CONCENTRATION COMPUTED BY
<br /> U.S. GEOLOGICAL
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<br />
<br />Figure 18.--Computed versus observed concentrations of nitrite-plus-nitrate as nitrogen in the
<br />Yampa River, September 23-24, 1975 (U.S. Geological Survey and Pioneer-I models).
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