"Habitable Planets and the Question of Life in the Galaxy" - Dale Dickenson (See Evolutionary and Revolutionary Sciences, Box 1, folders 29 and 30), Box: 2, Folder: 1. Wallace E. Pratt papers, RH MS 870. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/33969 Accessed May 19, 2024.