"Geology of the Eastern Venezuela Basin (Anzoategui-Mongas- Sucre-Eastern Guarico Portion)" Hollis D. Hedberg, Geological Society of America, V. 61, pp. 1173-1216, 1950, Box: 10, Folder: 37. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/149259 Accessed November 28, 2024.