Arizona vs. California, et al: Imperial Irrigation District, Imperial Valley, Salton Sea, 1955-1957

The Roland Gail Baker Papers are comprised of correspondence, contracts, notes, newsclippings, reports, printed matter and trial exhibits dating from 1865 to 1965. The bulk of the collection contains Baker's engineering work in water supply and other public works projects from 1944-1960. The collection has been divided into two series: Arizona Water Supply and City of Phoenix.

The Arizona Water Supply series is composed of a variety of reports, correspondence, notes, etc. related to various aspects of Baker's work in securing water for Arizona from the Colorado River and its tributaries. Most of the pages in the series are research materials in support of the Central Arizona Project and the water rights litigation Arizona vs. California, et. al. Many of the memoranda and reports in the series were written by Perley M. Lewis. A large portion of the Arizona vs. California, et. al. materials are reviews of testimony and published trial exhibits with holograph notations by Perley M. Lewis.

The City of Phoenix series contains material documenting a variety of municipal public works projects and the purchase of local privately-owned water companies by the City of Phoenix. The public works projects include sewer and bridge construction and paving projects.