Petroleum Industry/Industralization. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library.
Cite Finding Aid
Petroleum Industry/Industralization. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/490406 Accessed March 13, 2025.
