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261. National Agricultural Lands Study. The Program of Study. Washington, D.C.: U.S. Government Printing Office, n.d. R1.1/No. 10, Box: 31. William J. Cohen papers, MSS 0468. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/191900 Accessed September 19, 2024.