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Figure <br />Page <br />13. Frequency of Colorado River peak flow dates during <br />1907-1989 (N - 83 years) and capture dates during <br />1975-1988 of razorback suckers (N = 42 fish) in spawning <br />condition (expressible sex products present) in the <br />Grand Valley, Colorado ......................................... 40 <br />14. Mean monthly discharge of the Colorado River at the top <br />of the 15=mile reach during recent (1954-1989).and <br />historic (1902-1942) times ............. 50 <br />I. Daily-mean, main-channel temperatures in the upper <br />Colorado River in or near the 15-mile reach, 1983-1990...'...... 77 <br />viii <br />1