Excerpts from the report: From three general sources the information contained in this report was obtained. First, there is a group of articles devoted to the systems of marketing many farm products, including grains, many of the vegetables and fruits, and many other articles whose production is of appreciable amount. The list includes not only plant products, but also the products of the dairy and livestock. The articles for these products were all written by employees of the department who are specialists in the particular subjects handled by them and who have obtained their information in a large degree in the course of traveling throughout the country, and to some extent information has been obtained by them by correspondence. A second group of articles concerning systems of marketing is composed of reports of producers' cooperative marketing associations and of noncooperative marketing agencies. The managers of many associations and agencies were requested to contribute descriptions of their systems of doing business, for inclusion in this report, and articles were received from 66 of them. A third group of statements bears upon the demand for farm products at trade centers.