Catalogue of Books by Paraguayan and Foreign Authors, [found in packet from Harold Herd's trip to Paraguay, Panama, and Brazil], 1969, Box: 19, Folder: 40. Herd family papers, RH MS 1374. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/211641 Accessed June 25, 2024.