Unused postage, Four stamp Nikko National Park souvenir set, Japan, [face values of 2, 4, 10, and 20 "sen"], 1938, Box: 16, Box: 2, item: 15. Herd family papers, RH MS 1374. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/211368 Accessed December 21, 2024.