The University of California Cooperative Extension Records for Merced County span the years of 1916-2000. Records include reports and information on irrigation districts, fire protection districts, infrastructure improvement, economic outlook, migrant workers, rodent eradication, WWI and WWII home front activities, Great Depression impact and relief programs, land management, rural development, and correspondence. A large portion of the records are related to agriculture in Merced County, San Joaquin Valley, and California and include trial reports and reference material on crops, domesticated animals, wildlife, integrated pest management, fertilizer, pesticides, water, soil, and climate. These records also include reports and information on the work of the Home Demonstration Agents, who later became the 4-H advisors. Subjects include: home economics, nutrition education, home gardens, home beautification, youth development, and lesson plans. The collection includes a wide variety of formats: typed reports, data sets, local newsletters and press releases, maps, audiovisual material, photographs, slides, scrapbooks, and a variety of publications from the county, state, and national level.