The department shall take all appropriate steps to reduce and prevent unemployment; to encourage and assist in the adoption of practical methods of vocational training, retraining and vocational guidance; to investigate, recommend, advise and assist in the establishment and operation, by municipalities, counties, school districts and the state, of reserves for public works to be used in times of business depression and unemployment; to promote the reemployment of unemployed workers throughout the state in every other way that may be feasible; and to these ends to carry on and publish the results of investigation and research studies.