The collection contains research regarding Blake Gumprecht's book The Los Angeles River: Its Life, Death, and Possible Rebirth. Materials include correspondence, photographs, audio tapes, VHS tapes, and maps. The collection consists of research material dating from the early twentieth century to the early twenty-first century regarding the Los Angeles River and Aqueduct that was utilized by Gumprecht for his book.

Report, correspondence, documents, maps, photographs, clippings, etc., pertaining to projects in hydraulics, sanitation, irrigation, municipal water supply, surface water and groundwater hydrology, and soil in California and other Western states, particularly for the City of Los Angeles regarding water supply from the Owens Valley.

This collection contains reports, correspondence, documents, maps, photographs, clippings, etc., pertaining to projects in hydraulics, sanitation, irrigation, municipal water supply, surface water and groundwater hydrology, and soil in California and other Western states, particularly for the City of Los Angeles regarding water supply from the Owens Valley.

The collection consists of correspondence and reports concerning the Colorado River and flooding in the Imperial Valley, the Hetch Hetchy Project, Los Angeles water supply, the Southern Sierra Power Company, the salinity of San Francisco Bay and Sacramento-San Joaquin River Delta, flood control and irrigation projects, groundwater, and land appraisal throughout California and other western states.

The collection consists of correspondence, notes, news clippings, etc., related to Nordskog's water interests. Includes materials related to "water frauds" in the Owens Valley (including notes and an outline for his unpublished manuscript on the Owens Valley controversy), the Los Angeles Aqueduct, Boulder Dam, San Gabriel Dam, sea water conversion, California water problems, the Feather River Project, Metropolitan Water District of Southern California,the Colorado River, etc.