| [The Salton Sea in August, 1906] | [Frontispiece] |
| Opposite page |
| [Relief Map of Imperial Valley] | [19] |
| [A Part of Colorado River Watershed] | [31] |
| [Agricultural Lands Eroded] | [57] |
| [A Flood Waterfall] | [58] |
| [Nearer View of Flood Cataract] | [58] |
| [Channel Cut by Runaway River] | [60] |
| [Hind-Clarke Dam] | [89] |
| [Railroad Track on Reconstructed Levee] | [89] |