Earth summit by date - Newsletter of environmental and energy study institute, 1991-1992

Earth summit by date - Newsletter of environmental and energy study institute, 1991-1992, Box: 6, Folder: 53. Personal papers of John G. Clark, PP 399. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/118081 Accessed December 25, 2025.