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<br />002853 <br /> <br />. <br /> 20 <br />.. 15 <br />w <br />l- <br />e;; <br />u.. <br />0 10 <br />ffi <br />III <br />::E <br />:;) <br />2 5 <br /> 0 <br /> 0 2 <br /> <br /> <br />4 6 8 10 12 14 16 18 20 22 24 176 178 180 182 <br />CONCENTRATION, IN MICROGRAMS PER GRAM IX 10-3) <br /> <br />Figure lOa.-Frequency distrihution of iron in stream sediments <br />of the Yampa River hasin, August-September 1975. <br /> <br /> 20 <br />. <br />.. 15 <br />~ <br />u; <br />u.. <br />0 10 Chromium <br />0: <br />w <br />III <br />::E <br />:;) <br />2 5 <br /> <br /> <br />5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 <br />CONCENTRATION, IN MICROGRAMS PER GRAM <br /> <br />Figure lOb. - Frequency distribution of chromium in stream sediments <br />of the Yampa River basin, August-September 1975. <br /> <br />. <br /> <br />19 <br /> <br />, <br /> <br />11.....;~&. <br />