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The base grid was compiled by the Bureau of Land Management from official records of cadastral surveys.
The land status was compiled for printing by the Bureau of Land Management from the offical federal records with additional data furnished by…

Base data compiled in 1986 from USGS 1:100,000 scale topographic maps dated 1979-1987. Planimetry revised from aerial photographs taken 1982-1986 and other source data.

This map shows the topographic survey and county lines of the area around the Los Angeles aqueduct as it makes its way from its source at the Long Valley reservoir north of the city down to the city itself.