222.2 Keyes, Dale L. Land Development and the Natural Environment: Estimating Impacts. Washington, D.C.: Urban Institute, 1976. S0.1/No. 28

222.2 Keyes, Dale L. Land Development and the Natural Environment: Estimating Impacts. Washington, D.C.: Urban Institute, 1976. S0.1/No. 28, Box: 29. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/191832 Accessed September 19, 2024.