Columbian-Venezuelan dispute over the Maracaibo Oil Region - the expulsion of Colombian squatters from the oil province by Venezuela, 1971, Box: 15, Folder: 11. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/490277 Accessed May 04, 2024.