Excerpts from the Foreword: The aim of this handbook is to assemble in considerable detail materials which will be helpful to State extension economists in dairy marketing as well as others. Special attention has been given to sources of information, filing systems, and a procedure for keeping economic and dairy statistics up to date. Extension economists interested in revising their filing system or current information file will find this handbook helpful. It is suggested that only those parts of interest to a particular State be used. Few States will have need for as detailed a filing system or current economic information series as is included here. Local sources of additional information can easily be added. Significant contributions to this publication were made by workers in dairy marketing at the agricultural colleges and by State and Federal workers engaged in (1) market news service; (2) administering marketing regulations, standards, price support programs and the like; and (3) preparation of periodic reports relating to dairy marketing. Recognition is also given to the cooperation received from economists with district Federal Reserve Banks, dairy associations, farmer cooperatives, and other farm organizations.