“F.O.B. Detroit,” _Outlook_, III (1915), 980–86. A sample of the industrial type of city which is built around the production of a single product—the automobile. (IV, 6; IX, 1.) Homburg, F. “Capital Cities,” _Jour. Geog._, XIX (January, 1920), 8–15. Kellogg, Paul U. (editor). _The Pittsburgh District_ (New York, 1914). Introductory volume of the Pittsburgh Survey, one of the most comprehensive studies of an industrial, urban area. Contains material bearing on many phases of city structure and city life. (V; VI; VII; VIII; IX, 1, 3.). Kenngott, George F. _The Record of a City: A Social Survey of Lowell, Massachusetts_ (New York, 1912). A cross-section of a typical manufacturing city. (V; VI; VII; VIII; IX, 1, 3.) McLean, Francis H., Todd, Robert E., and Sanborn, Frank B. _The Report of the Lawrence Survey_ (Lawrence, Massachusetts, 1917). (V; VI; VII; VIII; IX, 1, 3.) “The Right of the Community to Exist,” _Living Age_, CIII (October 4, 1919), 46–48. Roberts, Peter. _Anthracite Coal Communities_ (New York, 1904). A study of mining communities in the United States. (V; VI; VII; VIII; IX, 1, 3.) Steele, Rufus. “In the Sun-Spot,” _Sunset_, XXXIV (1915), 690–99. A study of Los Angeles, the city of moving pictures. (IV, 6; IX, 1.) Semple, Ellen. “Some Geographical Causes Determining the Location of Cities,” _Jour. School Geog._, I (1897), 225–31. ——. _Influences of Geographic Environment, on the Basis of Ratzel’s System of Anthropogeography_ (New York, 1911). A comprehensive work dealing with the factors in the natural environment in relation to the settlement and the activity of man. (III, 2, 3.) Tower, W. S. “Geography of American Cities,” _Bull. Amer. Geog. Soc._, XXXVII (1905), 577–88. Distinguishes between industrial, commercial, political, and social centers and suggests that cities might combine several of these functions. Gives examples of each type, pointing out their distinctive characteristics. (III, 2, 3.) Wood, Arthur Evans. _Some Unsolved Problems of a University Town_ (Philadelphia, 1920.) A study of housing, public health, and dependency in Princeton, New Jersey. (VI, 10; VII, 5.) In the current periodical literature one can find numerous articles dealing with the various functional types of cities of the present day. The _National Geographic Magazine_ has many numbers which are devoted to individual cities from this standpoint.