Harris, Emerson Pitt. The Community Newspaper (New York, 1923). (IX, 3.)

Kingsbury, J. E. The Telephone and Telephone Exchanges: Their Invention and Development (London and New York, 1915).

Lewis, H. M., and Goodrich, E. P. Highway Traffic in New York and Its Environs (New York, 1924).

The results of a study embodied in a report for the Committee on a Regional Plan for New York and its Environs. (IV, 2; V, 4, 5; VI, 2; VII, 2, 4.)

Park, Robert E. The Immigrant Press and Its Control (New York, 1922).

A study of the organization and the influence of the press in the immigrant communities of the large city (IX, 3.)

The municipal transportation and communication question has developed a large literature which is to be found in many separate works on the telephone, telegraph, radio, street-car systems, busses, automobile, mail service, newspaper, and railways as well as in municipal reports, technical and administrative journals, and textbooks on the city.

3. The existence of streets, pavement, alleys, sewers, and other devices of the same sort that characterize the city as a physical mechanism influence the behavior of the person and the group, and as such are of interest to the sociologist.

Hirschfeld, Magnus. Die Gurgel Berlins, Vol. XLI in “Grossstadt Dokumente” (Berlin, 1905).

A study of the main street of Berlin from the standpoint of its effect on the individual and as a revelation of city life. (VI, 2; VII, 2, 4.)