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<br />. <br /> <br /> <br />lit <br />~ <br />('j <br />" <br /> <br />Techniques of Water-Resources Investigations <br />of the Unit€d States Geological Survey <br /> <br />. <br /> <br />Chapter Al <br /> <br />SOME STATISTICAL TOOLS <br />IN HYDROLOGY <br /> <br />By H. C. Riggs <br /> <br />Book 4 <br /> <br />HYDROLOGIC ANALYSIS AND INTERPRETATION <br /> <br />. <br />