State intervention - "Pattern of state intervention" by J. Devaux-Charbonnel and "State regulatory activity" by Hambleton, 1967 - 1975, Box: 19, Folder: 4. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/490478 Accessed January 14, 2025.