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198. Hammer, Green, Siler Associates. Comprehensive Planning Assistance in the Small Community. Washington, D.C.: Hammer, Green, Siler Associates, 1969. U0.1/No. 23, Box: 28. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/191797 Accessed September 19, 2024.