Abstract The Patterson Ranch Company was a livestock, dairy, and agricultural farm originally located on the Oxnard plains. The ranch was owned by New York farmer John D. Patterson, who hired managers to run the farm for him. Peter Hartveld, a Dutch immigrant, was the ranch foreman and responsible for much of the day-to-day running of the ranch. Hartveld and his family lived in the main ranch house between 1917 and 1987. The collection covers the day-to-day management of the Patterson Ranch Company...