D. Maddy. “An Evaluation of Climate, Crustal Movement and Base Level Controls on the Middle-Late Pleistocene Development of the River Severn, U.K.”. Netherlands Journal of Geosciences 81 (December 1, 2002): 329-338. Accessed April 2, 2026. https://njgjournal.nl/index.php/njg/article/view/11403.