Excerpts: The sizes and types of feed mills vary widely over the country depending in part on the feeding practices in the area and whether the mill is located in a grain surplus or deficit region. Moreover, the design and construction of feed mills, especially large ones, is a specialized business. A number of questions of a general engineering nature must be answered, in the initial planning stage of any mill, to obtain an efficient plant. In order to assist farmers' cooperatives and others in planning feed mills, a study was made in 1947 by the Cooperative Research and Service Division of the Farm Credit Administration, in cooperation with the Bureau of Plant Industry, Soils and Agricultural Engineering, of typical installations in 26 mills in 11 States. This report is designed to give boards of directors of farmers' cooperatives and others interested a general idea of what is involved in the construction and operation of feed mills of various sizes. Each mill must be designed to meet a variety of local conditions. Services of an engineer experienced in mill design and operations are desirable in all cases and indispensable for the larger mills.