60. Council on Environmental Quality. The Delaware River Basin: An Environmental Assessment of Three Centuries of Change. Washington, D.C.: U.S. Government Printing Office, 1975. R2.4/No. 23

60. Council on Environmental Quality. The Delaware River Basin: An Environmental Assessment of Three Centuries of Change. Washington, D.C.: U.S. Government Printing Office, 1975. R2.4/No. 23, Box: 23. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/191615 Accessed September 18, 2024.