This study of the history of the Twin Cities was begun five years ago, and has been concerned particularly with tracing the development of metropolitan economy in the Northwest. While in itself, this constitutes a rather narrow field of investigation, it has been supplemented by considerable attention to the broader aspects of metropolitan economy throughout the United States and in Europe. The results of the latter study do not appear directly in this monograph, but have aided materially in its preparation.
The material on which the monograph is based has come not only from printed sources, both primary and secondary, but more especially from numerous reports, municipal, state, and federal; from newspapers and manuscript materials found in the Minnesota Historical Society and in the libraries of the commercial organizations of the Twin Cities; and from interviews with business men familiar with the development and present situation of the cities.
The whole study bears witness to the guidance and help of Professor N. S. B. Gras, without whose encouragement the work would probably not have been undertaken; without his direction and assistance it could certainly not have assumed its present form.