Higuchi et. al, "The Liquid-Liquid Countercurrent Separation of a Menthol-Menthyl Acetate Mixture,", 1953, Box: 11, Folder: 2. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124636 Accessed December 21, 2024.