| Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. I desire gratefully to acknowledge my in debtedness to the Smithsonian Institution, the U. S. Reclamation Service, the U. S. Geological Survey, the American Society of Civil Engi neers, and the ofiicials of the Southern Pacific Railroad Company, for their courtesy in fur nishing me information, or permitting me to make use of their maps, diagrams and illus. |
