"Investigation of the Physical and Chemical and Characteristics With Analysis of a Few Groundwater Wells and the Level of Contamination in the Rada’a Albaydha City, Yemen". (2025) Hadhramout University Journal of Natural & Applied Sciences, 22(1). موجود في: https://hu.edu.ye/hu-publications/journals/index.php/hujnas/article/view/721 (تاريخ الوصول: 28 يوليو 2026).