The collection primarily documents the farm's second site in El Cajon. There are materials relating to local water projects and a large collection of San Diego topographical maps prepared by the United States Geological Survey.

The Allen Dairy was built by Seveno Allen in 1885. It was originally located in Mission Valley where it remained until 1957, when it was relocated to El Cajon. It was the first commercial dairy to operate in San Diego County, growing to considerable prominence before 1950. In 1975, the last owner, Jack Allen, closed down operations due to financial difficulties. In 1978 a housing development was constructed at the El Cajon dairy site.

2.50

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