Tripathi, G. N., and A. E. Fryar. “Integrated Surface Geophysical Approach to Locate a Karst Conduit: A Case Study from Royal Spring Basin, Kentucky, USA”. Journal of Nepal Geological Society 51 (December 31, 2016): 27–37. Accessed April 24, 2024. https://www.nepjol.info/index.php/JNGS/article/view/24085.