Harbaugh, John W., and Michel Ducastaing. “Historical Changes in Oil-Field Populations As a Method of Forecasting Field Sizes of Undiscovered Populations: A Comparison of Kansas, Wyoming, and California”.
Bulletin (Kansas Geological Survey) (January 1, 1981): 1–56. Accessed April 8, 2025.
https://journals.ku.edu/kgsbulletin/article/view/23609.