Stamp Booklet Commemorating Twenty Years of the Space Age featuring Cosmonaut Alexei Lenov, 1977-10-04, Box: 1, Folder: 16. Robbins Family Papers and Memorabilia, RH MS 1364. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/168800 Accessed January 27, 2025.