Based on data in the 1966 Pesticide and General Farm Survey, a comparison of labor-use practices of different types and sizes of farms showed that family workers were still the major source of farm manpower in 1966. Over half the farms with sales under $2,500 used only family labor, yet only 6 percent of the large-scale farms operated with just family labor. Farmers hiring labor used more family labor than farmers not hiring labor. When hiring, operators of small farms mostly used seasonal labor. Seasonal hired help were used more in the Pacific and Southern Regions, with their most significant contribution on large vegetable and fruit and nut farms. Regular hired workers were the major source of hired manpower for large-scale farms and for most of the dairy and livestock operations in the Northern Regions. Total hours of labor used and proportion that was hired also varied by farm type. A tobacco farmer used 3,625 hours of labor, with only 18 percent of it hired, while a vegetable farmer used 7,600 hours, with 63 percent of it hired. (Author)