281. New Castle County Department of Planning. The Red Clay Valley Scenic River and Highway Study, 1989.

281. New Castle County Department of Planning. The Red Clay Valley Scenic River and Highway Study, 1989., Box: 31. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/191934 Accessed September 19, 2024.