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<br />l~ <br />~ <br />~ <br />C\l <br /> <br />c <br /> <br />2 <br /> <br />GENERAL FEATURES <br /> <br />EXPLORATION OF DAM SITES <br /> <br />SECTION PAGE <br />17 General information ...............n_..___..........._._............._._...__'.un.._....._..._.___............. 41 <br />18 Boulder Canyon ..u....m....m........n......mm..................u...._.............m._.............~..... 41 <br />19 Black Canyon ........................................n...................u_n.........._............................. 42 <br /> <br />CONCRETE AGGREGATES <br />20 Location of deposits ..... ....................uum_..........um.m...m....._..._........... 44 <br />21 Arizona deposit ...n.n...................n.._..................__...._........................._..........._......... 45 <br /> <br />CHAPTER III-DEVELOPMENT OF BOULDER DAM DESIGNS <br /> <br />22 Preliminary statements ......_.....___...__.......n..n__................_..__.._.._..___..................00. 47 <br /> <br />EARLY DESIGNS <br /> <br />23 First design .._..._....._.....................n...._........u._n..__u.................. ..__u_..n................... 47 <br />24 Design accompanying report of 1924 .h..........nmnm...... ............._.......mmn..._. 49 <br /> <br />MORE RECENT DESIGNS <br /> <br />25 Designs prior to construction .......mnm.....................m....._.............n...... 51 <br />26 Design at time of appropriation ...................h.u..n......m.........................m...._h.. 64 <br />27 Final arrangement of dam and appurtenances m........................h...........u.... 66 <br />28 Construction quantities ..nu.........h......mm...nm.._....._..............hm...m_......uu...... 67 <br /> <br />CHAPTER IV-PRELIMINARY CONSTRUOTION <br /> <br />29 Introduction ......................h..............................................................h......nn............ 59 <br /> <br />TRANSPORTATION FACILITIES <br /> <br />30 Railroads _....._.........h..h..........................u...._........u..................00.......... .....n.........h.. 59 <br />31 Highways and roads ..........................u..u..................n............n............................ 61 <br />32 150.ton cableway .m.mm.........m...................n..um..._..._........... .......m....m............ 63 <br /> <br />POWER FACILITIES <br /> <br />33 Construction power .............................00...00............................................................ 66 <br />34 Transmission Une .................................................................................................. 70 <br />35 Substation .........................................................................................._..................... 70 <br />