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58. Cook, Robert W. Regional Relationship of Delaware Economy. Newark, Del.: University of Delaware, Division of Urban Affairs, 1965. E0.5/No. 2/Vol. 1, Box: 23. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/191612 Accessed September 18, 2024.