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<br />. <br /> <br />v <br /> <br />. <br /> TABLE OF CONTENTS <br /> Page <br />. FRONTISPIECE i i <br /> ACKNOWLEDGMENTS i i i <br /> LIST OF TABLES . ix <br />. LI ST OF FI GURES x <br /> ABSTRACT . xiii <br /> INTRODUCTION <br />. Historical Background (Decline) 1 <br /> Endangered Species Act (Significance) 3 <br /> Rationale for Protection 4 <br />. Objectives of the Study 7 <br /> DISTRIBUTION AND ABUNDANCE 9 <br /> Fossil Records 9 <br />. Co 1 orado River System - General 13 <br /> Colorado River in Mexico. 16 <br /> Colorado River - Main Stem withi n U. S. 17 <br />. Gila River. 21 <br /> Sa 1t Ri ver 23 <br /> Verde River 25 <br />. San Pedro River 25 <br /> San Francisco River 26 <br /> Bi 11 Wi 11 i ams Ri ver . 26 <br />. Little Colorado River 26 <br /> San Juan River 27 <br /> <br />. <br />