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Hefferan, Kevin P. "Folds". Geology 320: Structural Geology. University of Wisconsin–Stevens Point. Archived from the original on October 25, 2015. Retrieved December 8, 2015.
Hefferan, Kevin P. "Folds". Geology 320: Structural Geology. University of Wisconsin–Stevens Point. Archived from the original on October 25, 2015. Retrieved December 8, 2015.
Jackson, Glenda (July 2013). "Oil and Ventura"(PDF). Ventura City Hall. Archived from the original(PDF) on January 31, 2017. Retrieved January 23, 2016.