See S. B. Warner, Jr., Private City (1968); R. S. Wurman and J. A. Gallery, Man-Made Philadelphia (1972); P. O. Muller et al., Metropolitan Philadelphia (1976); W. W. Cutler III and H. Gillette, Jr., ed., The Divided Metropolis (1980); T. Hershberg, ed., Philadelphia: Work, Space, Family and Group Experience in the Nineteenth Century (1981); A. A. Summers and T. F. Luce, Economic Development within the Philadelphia Metropolitan Area (1986).
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.