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188.8.131.52, Letter from Katherine Anne Porter to Donald B. Heintze, April 11, 1964, Box: 1, Folder: 22, item: 5. Ann Heintze papers, 0005-LIT. Special Collections and University Archives. https://archives.lib.umd.edu//repositories/2/archival_objects/479411 Accessed January 16, 2021.