Not available – first paragraph follows: Salinity and drainage problems have plagued agriculture in California from the time irrigation was introduced in the second half of the nineteenth century. The emergence and spread of such problems, and the variety of ways in which irrigators and public agencies have responded to them, may be traced in the histories of the Imperial and San Joaquin valleys.

This research was conducted under grant #W-610 from the Water Resources Center, University of California, Davis.