362.3 U.S. Army Corps of Engineers. Flood Plain Information White Clay Creek New Castle County, Delaware. Philadelphia, Pa.: U.S. Army Corps of Engineers, 1972. S5.4/No. 4

362.3 U.S. Army Corps of Engineers. Flood Plain Information White Clay Creek New Castle County, Delaware. Philadelphia, Pa.: U.S. Army Corps of Engineers, 1972. S5.4/No. 4, Box: 37. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/192238 Accessed September 19, 2024.