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<br />F <br /> <br />~ <br />~ <br />~ <br />N <br /> <br />o <br /> <br />CONTENTS <br /> <br />SECTION PAGE <br />Introductory statement ........00........ ..m.............mmm........m.................n ii <br />Engineering organization during construction nn..........mh..........m.........mn vi <br />Foreword 00.........00.......00....00........0000....00........00.. ..0000..........00............00...........00............. vii <br />Contents .............. ..............n..n.h.........................................--..............__............. 1 <br />List ot figures ......................n................n............nn.h.nnnnnn........__..0000...00.00000000.. 8 <br /> <br />CHAPTER I-INTRODUCTION <br /> <br />GENERAL INFORMATION <br /> <br />1 Scope ot bulletin ....n.......n................n...n.m..h....................__......n.. ...m...........__nn 13 <br />2 Colorado River ....000000.........00.............. ..............h....n..........n.....n..............n.....n.... 14 <br />3 Geological history ot delta region h....mm....nh........n........................__n............ 14 <br />4 Developments prior to 1918 ............mm.........m.............mn...........mn.....n....hm 16 <br />6 Developments 1918 to 1930 ...........mmmn................n......mm...... ....m................ 19 <br /> <br />PROJECT DATA <br /> <br />6 Financial requirements ........n.mn...........__.mm............m.n....................... 22 <br />7 Power contracts ...........000000.....____........................00..0000......................................__.00. 23 <br />8 Boulder Dam costs ....__........................nn..n.n.......n....h.......__.n..n...... ......00........... 26 <br />9 All-American Canal costs ....n...m................mmh........n...................................... 28 <br />10 Personnel ......00...00........00..00................__...00..000000....... 000000....................00..................00 30 <br />BIBLIOGRAPHy.................................................... 31 <br /> <br />CHAPTER II-PRELIMINARY INVESTIGATIONS <br /> <br />SURVEYS <br /> <br />11 Reconnaissance surveys nn...m..............m..................m............m.......m............... 33 <br />12 Early topographic surveys .....mn.m....n.mm..hm.mm...._....._..............mmhn.... 33 <br />13 Surveys prior to construction ......____mmnm.......mnm............h..h.....mn.............. 35 <br /> <br />GEOLOGICAL INVESTIGATIONS <br /> <br />14 General .........nn....__nn.......__..................................n.h...n......... ................................ 36 <br />16 Boulder Canyon ............00..........00..__.0000..........00.00..........................00n..h.........nn..... 36 <br />16 Black Canyon ........000000........__00...............__.. .............0000............__.__.....0000__.__... 38 <br /> <br />1 <br />