TY - JOUR AU - Miller, Marvin AU - Perry, Russell AU - Turrell, F. M. AU - Hoeger, John TI - Helicopters for frost protection JF - California Agriculture JO - Calif Agr Y1 - 1971/11/01 VL - 25 IS - 11 SP - 3 EP - 4 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v025n11p3 AB - Tests in Riverside County to study the effectiveness of a helicopter for frost protection in citrus resulted in a beneficial response in both air and fruit temperatures.